She's just 5 years old, but "Toddlers & Tiaras" star Isabella Barrett is already making nightclub appearances -- singing songs about her sex appeal -- and TMZ has obtained video evidence.

Barrett graced Libation NYC with her presence Monday night for a special charity fundraising event -- where she danced and sang along to LMFAO's "Sexy and I Know It."

In case you forgot -- Isabella is the same girl who said her fellow "Toddlers" star Paisley Dickey dresses like "a hooker."

Sure, the video's pretty cute -- but when we were six ... we sang songs from "Barney & Friends."

Looking like Marky Mark wannabes, 17-year-old Justin Bieber and his dad 37-year-old Jeremy showed off their smooth shirtless chests on the beach in L.A. on Wednesday.

There's nothing like quality topless family bonding.

Shameless underage fame whore Courtney Stodden couldn't leave well enough alone this weekend -- stripping down to a sacrilegiously tiny bikini in 30-degree weather ... and single-handedly destroying our Christmas spirit.

We can't decide if this makes it more or less creepy, but the guy in the Santa suit is Courtney's 51-year-old husband Doug Hutchinson -- and Saturday, the barely legal couple abandoned whatever shred of dignity they had left ... and exchanged dirty talk in the snow just north of L.A.

Quick reminder: Courtney won't be 18 until August 2012. Bad, bad, bad Santa.

Angelina Jolie, Brad Pitt, and all of their various children hit up "Michael Jackson: The Immortal World Tour" in Las Vegas last night.

Perhaps the tix were a birthday gift ... Brad turns 48 today.

Looking like twinsies, Eddie Cibrian's current wife LeAnn Rimes and his "Real Housewives of Beverly Hills" ex-wife Brandi Glanville got within arm's length of each other at Eddie & Brandi's kid's soccer game in L.A. this weekend.

For once they were on the same team.

Jennifer Hudson took her slender figure out for a stroll with her yoked wrestler fiancé David Otunga and their adorable son little David in L.A. on Thursday.

From the looks it, Jen and David have everything worked out.

Justin Bieber was smothered by his smokin' hot adult girlfriend Selena Gomez in Mexico yesterday ... and was so impressed by her incredible physique ... he snapped a few pics to capture the moment.

The couple is south of the border for a friend's wedding ... but yesterday, they spent the day taking in some sun at the hotel pool ... because, why not?

Abigail Breslin's hourly rate is $16,250 -- at least when she's doing voice work for her new animated movie "Zambezia" ... this according to her contract for the film.

TMZ has obtained 15-year-old Breslin's payment agreement with film producers -- and according to the docs, she earned a grand total of $65,000 for one 4-hour recording session ... voicing the character of Zoe, an adorable bird (right).

It's not Abigail's only massive payday this year either -- back in May she signed a one-week contract for the upcoming movie "New Year's Eve" ... worth $275,000.

What did you do when you were 15?

Not sure what to wear while in NYC on Monday, adorable 11-year-old Willow Smith decided to put on everything in her closet.

At least she looks warm.

Denise Richards and ex-husband Charlie Sheen made nice and enjoyed some quality time with their kids at eldest daughter Sam's soccer game in Calabasas this weekend.

Who'd ever think Denise and Charlie would ever be on the same team?

Porn legend Sasha Grey says she will NOT back out of a national elementary school reading program -- despite pressure from parents -- claiming she will "not live in fear" of her XXX past.

TMZ broke the story ... Grey -- who once won a Best Oral Sex award for her role in "Throat: A Cautionary Tale" -- participated in the "Read Across America" program at Emerson Elementary School in Compton, CA last week.

Afterward, the school received complaints for letting Grey around the kids. For the record, Grey has been out of the adult business for 2 years.

Now, Sasha has released a statement ... saying, "I committed to this program with the understanding that people would have their own opinions about what I have done, who I am and what I represent."

She adds, "I am an actor. I am an artist. I am a daughter. I am a sister. I am a partner. I have a past that some people may not agree with, but it does not define who I am."

"I believe in the future of our children, and I will remain an active supporter and participant in education-focused initiatives."

Check out the full statement after the jump ...