Hook Ups

TMZ broke the story ... Mark and Pia went on a dinner date in L.A. ... and now we know what they had for dessert -- a big, fat mouthful of each other.

As TMZ first reported, Pia and Mark went out on a date Friday night and it went real well ... so say our spies.

So here's how it went down. Pia and Mark both shoot their respective shows -- "American Idol" and "Dancing With the Stars" -- on the CBS Television City lot in L.A.

We're told Pia had her eye on Mark for several weeks, but needed an introduction. So Pia -- who turns out is pretty resourceful -- has a friend who is friends with Jericho, a contestant on "Dancing With the Stars," Pia gave her friend a piece of paper with her phone number on it, who then passed it along to Jericho, who then passed it on to Mark.

Mark, we're told, was more than receptive. Even though he has an album coming out Tuesday -- he rescheduled a music video shoot so he could go on his big date on Friday.

They were both gussied up as they left Gulfstream restaurant in Century City, as Pia told us she -- like everyone else -- was surprised she got the "A.I." heave-ho.

Until Pia got the boot, they were both rehearsing and shooting their shows next to each other at CBS Television City in L.A.

The 4-year-old rocked a wife beater as he made his move on a pretty young thing at an L.A. park.

Brody who?

The "Cougar" stars have been rumored to be hooking up for over a month.

Sources close to Lohan tell us ... even though LiLo and Sam officially aren't dating, Lindsay was under the impression Ronson wasn't seeing anyone else ... and Lindsay feels hurt and betrayed.

In fact, we're told Ronson recently dropped the L-bomb to Lohan ... telling her "I love you" as recently as this morning.

And buckle up ... because we're told Lindsay plans on confronting Ronson about the situation when Sam gets off the plane in NY later today.

It all went down at Spring Training in Tampa ... Cam and A-Rod's first born, 6-year-old Natasha Alexander, checked each other's makeup and had some girl talk -- we're guessing stuff like hair, clothes, dad's $275 million contract.

Spotted spooning at the Black Hill Zoo in Germany, the Small-Clawed Otters could barely keep their paws off each other on Tuesday.

Kenly got herself tatted up last week with Charlie's John Hancock -- reasons unknown.

Trying to figure out why anyone in Charlie's world does anything is only going to give you a headache.

Sheen dropped the news last night, posting to his Twitter page: "Update: Sober Valley Lodge; Rachel has left the building..., We're sad.... Over it... Applications now being accepted! #winner"

But today, Charlie tells us, "She came back, my bad all good. Love her with the three parts of my heart."