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Whether she was onstage or in the crowd at this weekend's Coachella Music and Arts Festival in Indio, Rihanna made sure to turn heads in her sexy outfits!

On Sunday the 24-year-old R&B starlet rocked a pair of studded denim shorts and a cropped top that read "PEACE", and when she performed with DJ Calvin Harris, she ended up riding around on a pal's shoulders as they waded through the crowd.

At one point during her set, Rihanna reached out to give BFF Katy Perry a hug, and the "California Girls" singer was later spotted crowd surfing during the show.

Ashton Kutcher has rebounded (again) after the breakup of his marriage to Demi Moore -- this time, with his former That 70's Show co-star Mila Kunis!

X17 photographers have spotted the actors together on multiple occasions, recently. Ashton and Mila have even spent the night at each others' houses!

Today we saw the two furniture shopping and grabbing a sushi dinner together tonight at Asanebo in Studio city before they returned to Ashton's new mega-mansion in the Hollywood Hills.

Our photographer tells us the couple looked more than cozy together inside the restaurant: "Ashton was touching Mila's hand and Mila was all dressed up. She looked hot; this was definitely more than a dinner between friends -- this was a full-on date!"

Mila was wearing skin-tight skinny jeans and super-high heels, while Ashton was in his uniform -- a baseball cap and sweater. Ashton chauffeured, with Mila in the back seat.

Will Mila and Ashton last? Or is this just another rebound romance for Kutcher?

Pippa Middleton could face jail time after a photo was snapped of her and several friends driving around Paris with a semi-automatic handgun pointed at photographers.

The 27-year-old sister-in-law of Prince William rode in the front passenger seat of an Audi convertible as the driver pointed a weapon at the shutterbugs, causing a concerned witness to file a formal complaint with Paris police. If the gun is real, the unidentified man holding it faces up to seven years in prison, and even if the weapon is fake, he'll still face up to two years.

Additionally, a law enforcement source tells Us Magazine, "If the evidence points to [Pippa Middleton's] involvement, she will be prosecuted. Anybody involved in the illegal use of a handgun in public is liable to arrest and interrogation." Yikes!

Well, sorta.

When Dr. Dre performed at Coachella over the weekend, he brought Tupac Shakur back from the dead via old footage and the work of some incredibly talented special effects artists. According to The Verge, the “video was composed by New York SFX company MPC using a mixture of live footage, wire-framing, and CGI. This was then fed into Musion’s holographic technology, which projects the image onto a special foil. The foil is based on principles set out in the old magician’s illusion Pepper’s Ghost, which trick audiences into thinking they’re viewing a person or object rather than a simple reflection. By using a lightweight foil which mimics the properties of semi-transparent glass, Musion is able to extend the concept’s scale without limiting the efficacy of the illusion."

Wow, we're not even going to try to pretend to understand that, but the results are definitely amazing -- check out the video above!

Taking the night off from diaper duty, Beyonce and Jay-Z made the most of their kid-free evening with a romantic dinner, and a basketball game!

The "Single Ladies" singer looked casual-cool in cheetah-print MC Hammer pants, a big black hat and hot pink heels that definitely made her stand out while sitting courtside at the New York Knicks game, where they played against the Miami Heat at Madison Square Garden, on Sunday night.

While the Carter's team lost the game 85-93, the couple still appeared to be having a blast, and ended the night by partying it up in the city.

Baby Blue Ivy has the coolest parents ever!

Despite the heavy downpour on Friday, the stars still came out in droves to party for three days straight at the Coachella Valley Music and Arts festival last weekend, and we're LOVING their looks!

Paris Hilton looked gypsy-chic in a colorful flowing maxi skirt, a sexy white bra top and drool-worthy turquoise jewelry as she stuck close to her new man, DJ Afrojack, and they were even spotted making out at the concert!

Emma Roberts, Gerard Butler (in the DJ booth!) and Mischa Barton were also among the many A-listers who made the trip down to the desert to party and play, but party producer Brent Bolthouse threw the most exclusive bash of the entire weekend. Bolthouse rented out an entire airplane hanger to throw his annual Neon Carnival party on Saturday night, which even included a neon ferris wheel.

We vote Paris Best Dressed celeb at Coachella this year!

Ben Affleck has a lot of mouths to feed!

The proud papa of three stepped out in Brentwood on Sunday afternoon to stock up on groceries -- and pizza! -- for his growing family, which now includes 2-month-old newborn baby boy Samuel.

Meanwhile the Oscar winner's wife, Jennifer Garner, stepped out in sweats on Saturday afternoon to run a few errands while Ben took over daddy duty.

The birth of baby No. 3 seems to have taken a bit of a toll on Garner's fashion sense, but Affleck is still looking sharp, as usual!

It's not hard to see why Kingston Rossdale made the Most Stylish Men Under 30 list this year!

The adorable 5-year-old donned stylish camo shorts, a plaid shirt and bowling shoes to walk the red carpet with mom Gwen Stefani on Sunday at Milk + Bookies' Third Annual Story Time Celebration at the Skirball Cultural Center, in LA.

Stefani looked equally fashionable in a black blazer, ripped skinny jeans and black boots at the event, which was also a fundraiser to raise money for children's education.

The No Doubt singer walked the catwalk with her son at New York Fashion Week last year, so it's no wonder little Kingston's so good at striking a pose!