64-year-old AEROSMITH singer STEVEN TYLER might be nailing Clint's 19-year-old daughter FRANCESCA.  And for those of you who didn't finish high school, that's a 45-YEAR AGE DIFFERENCE.The two of them showed up together at the Little Door restaurant in Los Angeles, and there are pictures to prove it. They were supposedly meeting JIM CARREY and RUSSELL SIMMONS there, but still, they were NOT interested in being photographed together.A source says that a "friend" of Francesca's asked the cameraman to delete the pictures.  He didn't.

The "Star" tabloid claims LIAM HEMSWORTH messed around on MILEY CYRUS with "Mad Men" star JANUARY JONES at a pre-Oscar party over the weekend. Liam showed up at the party stag, and witnesses say he and January were getting cozy for much of the night.-A source says, quote, "It looked like they had some hot chemistry.  They were all over each other . . . and they even kissed!"--To make matters worse, they left TOGETHER . . . in the same car.  And we can actually verify that part of the story, because there are pictures.

Sources say RACHEL MCADAMS and MICHAEL SHEEN have broken up.  There's no word what caused the split . . . and there's been no official word that it even happened.Rachel and Michael met while filming the WOODY ALLEN movie "Midnight in Paris".  They came out publicly as a couple in October of 2010.  He's 44, she's 34.

A female worker at LAX accuses RICKY SCHRODER of assaulting her.  She says he got mad when she told him he could only bring two bags on the plane, and swatted her arm when she tried to take his boarding pass.  Ricky says it was all a misunderstanding, but SHE was actually the one who hit HIS arm.  He added, quote, "I apologize to you, Miss, if I hurt your feelings and I didn't mean to."

A New York antique shop owner claims that "Weeds" star MARY-LOUISE PARKER threatened to kill him . . . and also called him a gay slur that rhymes with the word BAG. And it was all over payment for a purse her friend sold the guy.  The dealer says Mary-Louise told him, quote, "Do you want to wake up tomorrow?  I'll make one phone call."  Then she unleashed the homophobia. Parker's rep says she did NOT say either of those things . . . and the guy is just trying to exploit her celebrity status.

DAVE CHAPPELLE did a surprise set at a New York City comedy club Tuesday night . . . and was joined onstage by CHRIS ROCK.  After riffing for a while, they talked about going on tour together.  Chappelle said, quote, "After next Tuesday, I'm free for like 11 years."  Rock added that he'd be free to do some dates by Halloween.

 Ever since TINA FEY and AMY POEHLER hosted the Golden Globes, people have decided that they should host EVERYTHING.  Well, don't expect that for next year's Oscars . . . because Tina isn't interested. She says, "I just feel like that gig is so hard.  Especially for, like, a woman . . . the amount of months that would be spent trying on dresses alone . . . no way."Asked if there was even a SLIGHT chance she'd do it, she said, quote, "I wish I could tell you there was."

Buzzfeed.com has put out a list of 21 Surprising Facts About Your Favorite Childhood TV Shows . . . and perhaps the most interesting thing they reveal is Cookie Monster's REAL name.  It's:  Sid.  And there's a "Sesame Street" clip to prove it. All the "Rugrats" babies were voiced by women.Barney the purple dinosaur was originally intended to be a bear. Carmen Sandiego's middle name is Isabella. JONATHAN TAYLOR THOMAS was actually the oldest of the "Home Improvement" boys in real life . . . but not by much.  He's only one month older than ZACHARY TY BRYAN, who played the oldest brother, Brad.

A female ONE DIRECTION fan threw her shoe at HARRY STYLES during their concert in Scotland on Tuesday night . . . and it hit him in the CROTCH.  Harry was OK . . . and the fan apologized.  She says she didn't mean to hit him there, she just wanted something of hers to touch him.

It was a slow week on the "Billboard" albums chart, with not a single new album debuting in the Top 10.  MUMFORD & SONS remained at #1, selling another 63,000 copies of "Babel".  It's their fifth non-consecutive week at #1. And rock band ALABAMA SHAKES returned to the Top 10 for the first time in almost a year, as their album "Boys & Girls" sold 33,000 copies at #6.  Here's this week's full Top 10 . . .

1.)  "Babel", Mumford & Sons  (63,000 copies)

 2.)  "Unorthodox Jukebox", Bruno Mars  (48,000 copies)

3.)  "All That Echoes", Josh Groban  (41,000 copies

Arnold Schwarzenegger is in good hands ... 'cause his new chick is a very experienced, high-profile physical therapist ... TMZ has learned.Her name is Heather ... and she made her first public appearance with Arnold during a romantic dinner date in Santa Monica over the weekend. The next day, the two met up for a brunch ... and everybody knows there's no such thing as a platonic brunch. Sources tell TMZ ... Heather is not your average physical therapist ... she's worked with a myriad of professional athletes including UFC badass Georges St-Pierre. It's unclear if Heather is actually treating Arnold ... but one source close to the Governator tells us, "She is not in the normal group of people who treat him."

Perez Hilton is a dad. The 34-year-old celebrity blogger, multimedia entrepreneur and actor shared the big news on his website. Under a photo of father and son, Perez writes: "I am ready to announce that earlier this month I was blessed with the birth of my first child, a beautiful and healthy baby boy -- with lots of hair on his tiny head!"

TV TONIGHT

--"American Idol". . . 8:00 to 10:00 P.M. on Fox.  The top twenty finalists are announced.

--"Community" . . . 8:00 to 8:30 P.M. on NBC.  Malcolm McDowell guest stars.

 --"Project Runway" . . . 9:00 to 10:30 P.M. on Lifetime.  Joan and Melissa Rivers guest judge.

 --"Anger Management" . . . 9:30 to 10:00 P.M. on FX.  Cee Lo Green guest stars.