Jared Leto (shockingly!) acted like a prima donna at Sundance this weekend. The actor rock star Champion of Eyeliner, there to promote his movie Chapter 27 (fine, I guess he's an actor, a rocker, and a CoE) decided that he didn't want his picture taken while out at a club and was seen picking fights with fellow VIPers. Page Six reports:

JARED Leto was in a foul mood at the Sundance Film Festival in Park City, Utah, on Saturday night. Leto, who was promoting "Chapter 27" (in which he plays John Lennon's assassin) picked fights with photographers and clubgoers in the VIP section of Tao at Harry O's. When a photographer from WireImage attempted to snap Leto's picture, the eyeliner- clad cad shouted, "No! No more, bro!" Leto walked out - but not before a "big guy" yanked at his long tresses. Leto "whipped off his hat with earflaps on and stepped up to the guy," said a spy. "They were yelling at each other." But no punches were thrown. And though Leto left, he came back a couple hours later to look for the guy.

While Jared may not have been the sole instigator in this altercation, it's not the first time he's gotten into a public scuffle (you may remember his run in with Elijah Wood last fall). It sounds like if the guy hates publicity so much he should steer clear of big photo festivals like Sundance. Just saying.

Leto was also reported to have freaked out when he heard that Justin Timberlake may have been planning to perform at a party attended by the 30 Seconds to Mars frontman. Perhaps it had something to do with their mutual ex Cameron Diaz?

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Sienna is definitely living up to her party girl reputation at Sundance. Jude evidently dumped her because he was tired of her partying so this time she's doing it right by hanging out with guys who share her favorite past time. She was seen last week getting cozy with Josh Hartnett and they continued wherever they left off during celeb karaoke in the Heineken room in Park City. Still, that didn't stop Josh from "flirting with all the ladies" at the fest.

But don't feel bad for Sienna. She partnered up with Diddy at the Golden Globes, and the two have been seen in each others company quite a few times since. You know he'll never lecture her on partying too much even if he is a dad to a new set of twins. Where are those kids anyway? For more pics just read more

Kirsten Dunst is having trouble deciding on just one mop-topped man. Sunday morning Kirsten Dunst was seen trying to sneak out of Adrian Grenier's house and the next day she's looking awfully friendly having lunch with Drew's ex, Fab from The Strokes. This, only a week after she was reportedly getting cozy with Adam Brody at Hyde. Hey, she's young, single, and has her pick of the litter. Can you blame her for testing out as many options as possible?

My vote goes to Grenier for now (Hands. Off. The. Brody.) because they seem like-minded (since I totally know them, and all). Plus. he's pretty damn cute.

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Heath was spotted wearing a wedding band yesterday when he and Michelle took Matilda out for a walk near their home in Brooklyn. They are obviously loving family life, so we aren't surprised in the least. Last month it was rumored that the two had applied for a marriage license it is possible that it's a done deal! No word yet on if they will have a big ceremony, but knowing these two, the chances are probably not. Well, congrats to them both either way!

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We were beyond excited to have Jen and Courteney reunite on the small screen when Court announced that her BFF Jen will guest star on Dirt. Turns out it's going to be more exciting than we thought. Jen will star as another tabloid editor and Courteney's character's archenemy. But wait, it gets better. According to Michael Ausiello of TVGuide.com, "Aniston's character is a lesbian. What's more, she won't just mouth off to Cox's tightly wound counterpart; she's going to share a lip lock with her." Talk about ratings gold. Isn't it great to see what friends will do for one another.... for their art of course.

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Party in the city where the heat is on for Jessica Simpson and John Mayer. The two, who have maybe probably been quietly dating for at least a month, were spotted being generally adorable around the city this weekend. The couple hit the gym together to lift weights and take a yoga class. Awww, how fitness minded of them. People has more on their romantic Nobu date:

Simpson, 26, and Mayer, 29, longtime friends who've been linked off and on since the summer, chatted easily, and at a few points she leaned forward and he reached across the table to hold both her hands.

"They looked really cute together," says one witness at Nobu. "They were talking and laughing the whole time. She was constantly fixing herself to make sure she looked her best for him."

When the check came, she reached for her bag and he reached for his wallet. She, however, pulled out a lipstick while he grabbed the bill. After the meal, she took a trip to the ladies room, and when she came out, wrapped her arms around the much-taller Mayer and stood on her tiptoes for a kiss on the nose.

Forgive us for getting overly sentimental, but it's nice to see the cards play out in Jessica Simpson's favor for a change. She's had a rough year since her split from Nick and she and John seem like an odd but good match. Plus, not only does she look pretty smoking in that dress, but she's smiling, which has been all too rare for bubbly Jess recently. Fine, I'm a total sucker for the Simpson sisters. It's a sickness.

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