Hook Ups

Jennifer Lopez's lips say she's moved on to new BF/dancer Casper Smart -- but at least one of her fingers seems to be holding on to her ex.

While J.Lo snuck a few cougar kisses with Casper between rehearsals in L.A. ... she was still sporting what looks a lot like the 8.2 carat wedding ring she got from Marc Anthony.

Sara Gilbert is one helluva rebounder -- the former "Roseanne" star/ "The Talk" co-host was holding hands with 4 Non Blondes singer Linda Perry this weekend ... just a few months after splitting with her partner of ten years.

No word if the two are "official" yet -- but they definitely seemed couplish as they strolled around West Hollywood together.

For the record -- Perry ain't no one hit wonder ... she's super successful in the music world, having written and produced songs for everyone from Christina Aguilera to Pink.

Gilbert has two children with her ex.

Paris Hilton spent some quality time spinning on the water on Jet Skis with her new man friend, Grammy-winning producer/DJ AfroJack in Hawaii yesterday.

Looks like these two will be making beautiful music together.

Prince Harry was full on FLIRTING with a super hot waitress at a Las Vegas nightclub Sunday night ... and TMZ has the footage to prove it.

No word on the identity of the scorchin' brunette -- but sources inside XS nightclub at the Wynn Hotel tell us she was VERY LUCKY to get that close to the Prince, because dude was rollin' with an ARMY of security.

What happens in Vegas ... could get this chick into Buckingham Palace if she handles it right.

After attending a Halloween party together on Monday night, rumored lovebirds Wilmer Valderrama and Demi Lovato were seen sucking face outside Wilmer's house on Tuesday.

The couple previously dated back in 2010, after Demi split from Joe Jonas.

Marc Anthony doesn't need J.Lo to have a good time ... 'cause dude seemed to be having a blast in Costa Rica this week while some chick planted a big, fat kiss on his cheek.

Anthony -- who separated from his baby mama back in July -- threw a HUGE party a few days ago to launch his new TV show ... a Latin singing competition called "¡Q’Viva! The Chosen," which is set to debut in early 2012.

We're told Marc got behind the DJ booth for a while a spun a couple of records -- and later took a couple of cozy pictures with a woman named Dianna Perez, who's part of the crew.

"Family Guy" got it all wrong -- it's been 15 years since "Jerry Maguire," but ex-child actor Jonathan Lipnicki's still got the magic touch ... pulling seriously hot tail in Vegas last weekend for his 21st birthday.

You may recall -- "Family Guy" blasted Lipnicki in an episode last year, implying the once-adorable child actor had grown up into something ... less than attractive.

But that just ain't true ... because according to sources at XS Nightclub in Vegas -- where Jonathan celebrated his 21st on Saturday -- the actor had absolutely no trouble attracting several fine females. (exhibit a, above).

Newlyweds Robin Williams and his third wife Susan Schneider enjoyed a public display of face sucking while on their honeymoon in Paris on Tuesday.

Selena Gomez & Justin Bieber went to a Winnipeg Jets game this weekend ... but the only hockey they were interested in was of the tonsil variety.

Possibly dating former co-stars Blake Lively and Ryan Reynolds were spotted this morning outside Ryan's apartment in Boston, MA.

Wearing his and hers shades, "Real Housewives of Beverly Hills" widow Taylor Armstrong enjoyed a friendly lunch with "Most Eligible Dallas" hunk Matt Nordgren at Clementine Cafe in L.A. on Thursday.

While the Bravo stars have been rumored to be hooking up, Nordgren is adamant they are just "friends" ... and Armstrong just tweeted "I am NOT dating anyone from anywhere! Stop the rumors! I am trying to heal with my daughter."

Not only is it back on, but it must be getting serious again because Justin Timberlake had dinner at Angelini Osteria in L.A. last night with Jessica Biel ... and his parents.

Bradley Cooper and Jennifer Lopez are not a couple just yet ... but a source close to the pair tells TMZ they are indeed "casually dating."

As TMZ first reported, the two went on a dinner date in New York City last month. They had not been spotted out again until yesterday -- when a photo surfaced of Bradley Cooper driving an SUV and a woman who certainly looked like JLo ... covering her face in the passenger seat.

According to our sources, the woman in the photo is definitely JLo. We're told the two enjoy each other's company but are keeping things simple for now.

Here's Amanda Knox's pre-Italy ex-boyfriend David Johnsrud (left), leaving Amanda's mother's house in Seattle earlier this week ... and her ex-boyfriend from Italy who was recently acquitted of murder, Raffaele Sollecito (right).

Amanda sought comfort by secretly meeting with David almost immediately after she returned to the U.S., but her dad says they're just friends.

To further prove the point, check out Amanda's dad, Curt Knox.

Mehcad Brooks might be the next George Clooney ... maybe ... because the "True Blood" star had a romantic dinner with Clooney's ex Elisabetta Canalis this week ... and TMZ has the video to prove it!

The two dined at STK steakhouse in L.A. -- and after what seems like a date, they BOTH left in Mehcad's SUV.

Before Brooks and Elisabetta drove off together, we asked Mehcad, "How did you guys meet?" He cracked a big, GUILTY smile ... and joked, "We didn't meet ... I have no clue what you're talking about."

So, we gotta ask ...

Less than three months after breaking off their engagement at the VERY last minute, Kristin Cavallari and Jay Cutler were seen holding hands in L.A. today.

Pretty shocking they would reconnect ... especially because Kristin had already taken pictures IN HER WEDDING GOWN when the two suddenly called it quits.

But the Chicago Bears quarterback was spotted in the audience at "Dancing with the Stars" last night ... and now, some P.D.A. in front of the photogs.