Katherine Heigl and hubby Josh Kelley took beautiful baby Naleigh to the Farmer's Market in Hollywood Sunday. The couple is clearly green: they looked at fresh produce and toted reusable bags to put their groceries in!

Tons of celeb Mommies were out on Mother's Day weekend. See our full gallery here, featuring pics of Sarah Jessica Parker, her son and twin girls, Tori Spelling, Jennifer Garner and Britney Spears' sons.

Lady Gaga continues to crank out new music with the release of her latest single "The Edge of Glory."

Her new album doesn't hit stores until May 23rd, but already we've been able to hear "Born This Way," "Judas" and now this third infectious single.

After hearing the new tune, it's pretty obvious that Lady G is a huge fan of 80's music. Rad!

See Gaga's latest video for "Judas" ... after the jump.

Justin Bieber has taken to Twitter to defend himself after CSI's Marg Helgenberger called him a "brat" in an interview.

"I shouldn't be saying this, but he's kind of a brat," Helgenberger told a French radio station. "He was actually very nice to me, but he locked one of the producers in the closet. And he put his fist through a cake that was on the table."

Bieber made a cameo on CSI last season. But the 17-year-old Biebs dismisses such on-set antics as harmless pranks, and Tweeted responses to the actress' comments.

"It's kinda lame when someone you met briefly and never worked with comments on you. I will continue to wish them luck and be kind."

"I know who I am and sometimes people r just going 2 say what they want. Keep ur head up and be the man ur mama raised."

But, is the Biebs really a "man" yet? After all, he's only 17 ... and his antics seem to reflect as much. Last week Bieber made headlines when he was late to sit in his seat on an airplane. The flight attendant scolded Bieber, later saying, he "had been acting like a child and would therefore be treated like one."

Last May, the Biebs supposedly swore at the manager of an Australian TV show, and in September he reportedly was almost arrested for throwing a water balloon at a state trooper's crotch in Maryland.

The Biebs got a dose of his own prank medicine at the end of April when a concertgoer -- who was also 17, just like the Biebs -- threw eggs on stage at his show. That individual though, is getting charged -- with trespassing, breaking and entering and malicious damage.

See what Helgenberger had to say about Bieber's acting ability after the jump.

Who knew David Arquette and Kelly Osbourne were party pals?

The twosome joined friend Jeff Beacher of Beacher's Madhouse at Yellowtail inside the Bellagio, and we're told the group chowed down on the signature Tuna Pizza. Sounds delish!

After dinner, the group took the party to The Bank Nightclub where they witnessed the "Hottest Baby Momma" contest ... in honor of Mother's Day. Sexy good times in Sin City.

See which Britney Spears' ex was hanging poolside in Vegas over the weekend ... after the jump.

UPDATE - Alicia's rep confirms what X17 reported first -- the baby has arrived! Silverstone gave birth to son Bear Blu Jarecki, 7 lbs., 15 oz., on Thursday.

Alicia Silverstone had the best Mother's Day weekend ever ... thanks to the birth of her new baby!

X17online can report exclusively that Silverstone had a water birth at an LA-area birthing center at the end of last week. We've learned the new mommy is already at home with her little bundle!

Throughout her entire pregnancy, the 34-year-old actress has been promoting her new diet book The Kind Diet ... which follows vegan principle.

Silverstone and hubby Christopher Jarecki, 40, confirmed they were expecting their first baby together back in January.

Wow ... time has flown by!

Funnyman Russell Brand skipped out on the traditional Mother's Day celebrations and took to Miami Bay for some jet skiing with a male friend. Brand is in Miami to begin filming on Rock of Ages this week.

Russell certainly seemed concerned for his safety with the toddler-sized life vest he was wearing. And isn't cute how is bro is holding on tightly to his waist? He must be missing Katy right about now! She's in New Zealand on tour but also taking some of the local sights.

Check out how she spent her weekend, after the jump ...

Jason Statham and lady love Rosie Huntington-Whiteley (seriously, could her name be any more British?) shopped for sunglasses on Sunday at Oliver Peoples in Malibu. Looks like the sexy Brits are going to keep their eyes safe ... so they can always check each other out!

Statham was once again spotted wiping his mouth while out with Rosie; she must be one serious smoocher! See our gallery for the pics. The model/actress was recently chosen as Maxim's hottest woman in the world for 2011.

Meanwhile, Rosie's ex Olivier Martinez (currently Halle Berry's fella) was spotted having a seemingly romantic dinner with French actress Elsa Zylberstein over the weekend. X17online has the exclusive photos!

Amanda Bynes knows how to keep her energy up ... double fisting her favorite caffeinated drinks from Coffee Bean and Tea Leaf in Beverly Hills. Easy girlfriend!

The 25-year-old actress, who quit Hollywood for a hot minute last year, is ready to get back to acting. Would we have missed her? The jury's out on that one.

Aside from her career, Bynes tweeted last month about her missing dog ... only to find out less than a week later, the dog was dead. Ok, the good news ... Amanda has a new puppy named Tiara.

With her recent roller coaster life, Ms. Bynes deserves all the java her heart desires. See a tight shot of the Hairspray actress sucking down her frothy treat ... after the jump.