Hook Ups

Whitney Houston's daughter engaged in some hardcore PDA -- including a kiss -- with her secret BF yesterday ... a guy who happens to be her pseudo-adopted brother ... and TMZ has the video.

19-year-old Bobbi Kristina was seen in a full-on lip-lock with 22-year-old Nick Gordon during a lunch run in Atlanta Tuesday ... confirming suspicions the two are romantically involved.

As we previously reported, Nick and Bobbi go way back ... when Whitney unofficially "adopted" Nick into the family roughly 10 years ago after learning Nick was having problems at home. He's been living with the Houstons ever since.

Again, Bobbi and Nick share no blood relation ... but we still gotta ask ...

Katy Perry and a hot guy who's definitely not Russell Brand stepped out in L.A. -- but we have solid evidence the BF is waaay more likely to be a BFF. Drift caught?

Chris Brown and Rihanna are dangerously close to getting back together, sources close to the ex-couple tell TMZ -- but the singers' friends are desperately trying to keep them apart ... for their own good.

According to sources, Rihanna is still head over heels for Chris -- despite that fateful night 3 years ago when he brutalized her -- and if it weren't for the media and her fans, she would already have taken him back.

We're told Chris also has extremely strong feelings for Rihanna -- current girlfriend be damned.

Now, sources tell us, Rihanna and Chris' friends are terrified they'll get back together -- and they're doing everything they can to prevent a possible reunion.

According to sources, friends on BOTH sides have expressed extremely strong reservations to Ri and CB about spending so much time together ... warning it's a terrible idea ... personally AND professionally.

But with Rihanna's birthday ... Chris and Rihanna's duets released this week ... friends fear they're fighting an uphill battle.

As one source put it, "You can't hold back love."

Chris Brown was so paranoid about keeping his attendance at Rihanna's birthday party a big fat secret -- he actually tried to FORCE partygoers to sign confidentiality agreements ... TMZ has learned.

Sources tell us, Chris refused to enter the private party Monday night at the famous Hearst Mansion in Beverly Hills until everyone signed an NDA -- sending his henchmen in beforehand to gather every partygoer's signature.

We're told although they didn't get EVERYONE to sign -- Chris eventually walked in ... and spent a huge chunk of the night nuzzling up against Rihanna.

According to sources, the two got real intimate -- sitting next to each other, talking, and holding hands ... all perfectly legal ever since the restraining order was lifted.

As for the rest of the party -- we're told it was jam-packed with celebs including Katy Perry, Bruno Mars, and Chris Martin (no Gwyneth).

Rihanna's cake was pretty badass too -- a giant spliff ... with a small Rihanna made out of icing, riding it like a horse.

Eat your heart out, Miley.

Chris' rep tells TMZ, confidentiality agreements were distributed only to workers at the party and anyone who was caught videotaping/snapping a pic of CB.

Reggie Bush ain't going back to the Kardashian well ... telling TMZ he's 100% NOT dating his old flame Kim ... despite an expensive lunch date this weekend.

Reggie was hanging out on Rodeo Drive in Bev Hills when we asked if he was back on with his reality ex. Reggie couldn't have been more clear -- hell no.

TMZ broke the story ... Reg and Kim were spotted on a lunch date at the Beverly Hills Hotel this weekend.

Jennifer Lopez and her 24-year-old boyfriend Casper Smart were quite the lovebirds and enjoyed a Valentine's Day frolicking on the sand in Santa Barbara on Tuesday.

Besides holding hands and taking long walks on the beach, Jen even climbed up on top of Casper to ride the swing together.

New York Jets interception-machine Mark Sanchez might actually have done something right this year ... and her name's Kate Upton -- this according to the super model herself.

Rumors have been spreading like wildfire ... Mark and Kate are an item -- but we asked the buxom Victoria's Secret angel straight up ... are you single ... and she played coy, replying, "What do you think?"

We pressed a little more ... asking if Mark was the mystery man -- Kate hedged, responding, "I don't know!"

As for the real truth -- Kate tells us, "It's whatever you think!"

So here's what we think -- if Mark had any game, he would have AT LEAST made the playoffs.

Love is in the air this Valentine's Day... and these celebs aren't afraid to show a little PDA. Can you guess which stars are behind these puckered pics?

Kim Kardashian has REUNITED with her ex-boyfriend Reggie Bush ... breaking bread with the NFL player at the Beverly Hills Hotel this weekend ... TMZ has learned.

Multiple sources tell us ... the two were smiling and laughing during the lunch date ... and played it cool when fans approached them for pictures and autographs.

We're told it seemed just like old times ... before Kim went off and married/divorced that other guy whose name we can't remember.

George Clooney ... plus Stacy Keibler ... plus an air horn ... equals practical joke caught on tape ... and it's hilarious.

Although "Dexter" co-stars Michael C. Hall and Jennifer Carpenter finalized their divorce in December, the former couple couldn't be any closer as they walked arm-in-arm and snuggled in Venice Beach on Wednesday.

Call him Mitt "Love Glove" Romney ... 'cause TMZ has learned a condom company has officially launched a line of special rubbers dedicated to the Republican candidate ... despite not having Mitt's approval.

The condom company launched a website this week, offering the political jimmys for roughly five bucks a pop.

TMZ spoke with the owner of the company -- which also famously launched Obama condoms a while back -- who tells us he KNOWS his operation is perfectly legit because a State Supreme Court judge previously ruled his products are protected under his First Amendment right to free speech.

Although rumors of his dating escapades have swirled since he split from Kim Kardashian, sources close to Kris Humphries tell TMZ ... he has no plans to date anytime soon.

According to our sources, Kris has not dated anyone since his breakup from KK. We're told Kris has not gone out on a single date and right now his only focus ... is on basketball.

And it's working so far -- Kris is averaging career highs in points, rebounds, assists, blocks and steals.

Whitney Houston and Ray J sure seemed very couple-y outside a restaurant in West Hollywood last night -- because when it came time leave, Ray J was the PERFECT gentleman.

As the two were leaving Le Petit Four on Sunset Blvd last night, Ray J opened the door for Whitney, made sure she was safely snuggled inside, and then shut the door for her. Chivarly ain't dead!

The mystery is over ... Steve-O and Elisabetta Canalis are DEFINITELY more than friends ... and yesterday they engaged in a little mouth-on-mouth PDA to prove it.

There was a fierce debate in our newsroom ... some people felt that Elisabetta's decision to date the "Jackass" star is a step down from George Clooney. Others think she's decided status symbols don't bring happiness ... and since she might be happier with Steve-O, it's NOT a step down.

So, we gotta ask ...

Elisabetta Canalis and Steve-O went to a HAIR SALON this weekend ... TOGETHER ... so, it's fair to assume they're totally dating now, right?

Rumors have been swirling for weeks ... that George Clooney's ex-GF and the "Jackass" star have been getting pretty up close and personal in the past few weeks.

The two hit up Trust Hair Salon in West Hollywood on Saturday ... and as they both got into Steve-O's car ... we asked if they were officially more than friends.