Casper Smart was snapped tooting around town on his Kermit green Kawasaki Ninja on Monday, and we have to wonder what Jennifer Lopez thinks of his ride. I mean, we've never seen her on the back of the flashy crotch rocket, and we doubt we ever will! But she knew what she was getting into when she started dating someone 18 years younger than her...

J. Lo could always buy Casper a new bike for his birthday next spring ... last year she got him a totally tricked out white truck for his 24th bday, so it's not out of the question!

We love Lady Gaga's music and, for the most part, her message, but is she serious with this makeup ... and the leather headband?

Last night Gaga was snapped at Micky's in West Hollywood, and the 27-year-old pop star hung out with the cast of RuPaul's Drag Race and shot footage for her upcoming music video for "Applause," which is set to premiere this week.

“I will definitely NOT be at Micky’s tonight, and I will definitely NOT expect you there to be in my lyric video,” she tweeted. “I’M SERIOUS LA MONSTERS, ITS NOT LIKE I WILL BE HOPING YOU ARE THERE WITH YOUR APPLAUSE MAKEUP READY TO DANCE FOR ME AND WATCH DRAG.”

Gaga put her promotional pants back on bright and early this morning for an interview with Carson Daly, and yesterday she gave Ryan Seacrest a lesson in the fine art of applying clown makeup:

Well, kinda.

Kristen Stewart has reportedly enrolled in an English course at UCLA, because she's thinking about "life after film." However, don't expect to see K. Stew on campus anytime soon, because the Twilight starlet is enrolled in a correspondence course, which means students don't have to physically attend class.

A source tells The Sun:

"She never got to complete college and she wants to get a proper education. She is a voracious reader and cannot wait to get going on her correspondence course. It won’t be easy and it will mean putting in some fairly strenuous hours. But once she's graduated, Kristen will be able to do almost anything she wants, in or out of Hollywood."

Kristen's best friend Scout Compton got into the school, so perhaps after taking this one class K. Stew will think about going to get a Bachelor's degree?

Are we surprised?

On Monday night Rihanna went to dinner at The Lion with bestie Katy Perry in New York City, and the R&B superstar proudly showed off a clutch with a pot leaf on it. Not sure who made the bag, but we're thinking it could be one of kind...

RiRi has posted dozens (if not hundreds) of photos of herself smoking marijuana on Instagram and Twitter over the years, and in the past she's worn pro-marijuana tee-shirts and she even dressed as some sort of a pot princess for Halloween last year.

Earlier this spring Ri explained why she's so open about her love for the drug, telling Elle UK, "I'm posting pictures of myself smoking pot to tell the truth about myself. I’ve got so much to think about, why bring all this extra sh*t by being dishonest?"

Ri tweeted, "She. X She. #KatyAnna #RIHunited" and uploaded this snapshot:

From the beefy arms to the perfect amount of scruff, we can see why Miley Cyrus has this man locked down! Well, for now...

Liam Hemsworth waved to fans and photographers outside of Jimmy Kimmel Live! on Monday afternoon, and even in a simple black tee, the 23-year-old Aussie actor was looking smokin' hot.

But don't expect his Twitter feed to be heating up anytime soon, because at the Los Angeles premiere of his new flick Paranoia, Liam opened up about his recent decision to join the social media site and how he's keeping his feed strictly professional.

"On Twitter I don't share anything personal," Liam told E! News. "I try to keep as much of my personal life to myself, and I don't feel the need to go out and show the world what's happening in my life every second ... I think it's a good chance to connect with fans in a different way and give fans an inside look on films that you do. But it's very new to me and it scares the hell out of me."

"No shirtless selfies," he added with a laugh. Boo!

On Sunday Jennifer Aniston and Angelina Jolie were booked on the same plane to London, but rather than risking an awkward run-in with Jolie at Los Angeles International Airport, Aniston bumped her flight to Monday.

A source tells X17online exclusively, "Jen had her assistant reschedule the flight for today when her camp caught wind that Angelina was set to fly out after her appearance at the D23 Expo on Saturday."

Jolie was on British Airways yesterday afternoon with her son Maddox, and Aniston jetted out just before 6pm today.

This isn't the first time the We're The Millers star nearly bumped into Brangelina ... two years ago Aniston and fiance Justin Theroux narrowly missed running into Pitt and the kids at a movie theater in Hollywood, and there's a chance that Pitt and Aniston (and Jolie!) could come face to face at the Toronto Film Festival this fall...

RUN AND HIDE! A DEVIL CLOWN IS ON THE LOOSE! Oh wait -- nope -- that's just Lady Gaga being Lady Gaga. Taking a page from the Marilyn Manson fashion Bible, Mother Monster was spotted with garish make up, strutting her stuff in two different, but equally goth ensembles in Hollywood on Monday. The "Born This Way" singer was photographed wearing a school girl ensemble and leaving the oh-so-swank Chateau Marmont. Later that afternoon, the dark queen had an interview with Ryan Seacrest and was seen leaving E! studios wearing another spooky style.

Monday was quite the day for the in-your-face singer. Over the weekend, a low-quality version of Gaga's new single, "Applause," got leaked and true-to-form, the unruly songstress took control of the situation and released the official version of the hotly awaited song on Monday, one week prior to its scheduled debut.

And just last night Gaga caught our attention with this very minimal outfit:



Click HERE to see the gallery of Gaga's butt cheeks!

After suffering a seizure early on Friday morning at a recording studio in Hollywood, it looks like Chris Brown is on the mend.

X17 videographers caught the R&B star hanging out with several pals at his Hollywood Hills pad on Monday afternoon, but when asked about his recent health scare, Chris was NOT in the mood to chat.

In fact, one of his buddies approached our lensman and looked ready to rumble, so the cameras were turned off. Well, at least we know Chris is alive and well! Wonder if Rihanna sent him any love over the weekend?