Jennifer Lopez and Extra host Mario Lopez worked the flashbulbs while celebrating the grand opening of Planet Dailies and Mixology101 at The Grove Thursday night.

The American Idol judge's gunmetal grey dress is stunning. Mario's see-thru shirt isn't bad, either!

Those at the party got to see an exclusive viewing of JLo's newest video for "Dance Again" ... featuring her sexy young beau, Casper Smart. Watch the entire video below.

Talk about a sweet celebration!

In honor of Oreo's 100th birthday, Lady Antebellum showed up at The Grove on Tuesday morning to belt out a few of their hit tunes in a surprise free concert for one of America's favorite cookies!

Before singing "Happy Birthday" to a giant Oreo (yum!) the Grammy winning band kicked off a Happy Birthday flash mob, which was just one of seven similar celebrations that took place across the country in honor of the delicious treat.

After 100 years Oreo, you haven't aged a bit!

Mario Lopez is not only the host of Extra, but he's also an underwear designer!

The former Saved by the Bell hunk stopped by The Ellen DeGeneres Show to chat about his new undies line, Rated M.

Instead of just talking about the briefs, Mr. Lopez gave Ellen's audience a show-and-tell. Yowza!

Mario Lopez and baby mama Courtney Mazza are engaged!

The Extra host proposed during the couple's New Year's getaway in Ixtapa, Mexico, and he told Us Weekly, "We took a walk alone as the sun was setting. I told Courtney that I wanted the mother of my children to have their last name. She was silent at first from shock, then she leaped for joy and did a little jete!" Awww!

Lopez and Mazza have been together since 2008, and in September 2010 they welcomed daughter Gia. So when's the wedding? Lopez revealed that the duo plan to tie the knot in Mexico later this year.

Rob Kardashian made his way to The Grove on Thursday to chat with Extra host Mario Lopez, but he showed up in a curious clothing choice -- rolled-up jeans!

Considering the Kardashian gals are known for their fashion-forward looks, it's a bit of a surprise to see their little bro in high water pants. Then again, maybe he just really wanted us to see how white his Chuck Taylors are ... and they are spiffy.

Even though he really needed fashion advice this morning, Rob got fashion tips from Mario instead. Good thing Rob is prepared to trot his socks off today! "Time to rehearse all day! Working on this foxtrot! Next week is Most Memorable Year of Your Life and got a very meaningful song! Can't wait!" he Tweeted Thursday afternoon.

Wonder what his song will be -- perhaps something dedicated to his father?

Eva Longoria and Mario Lopez make such a cute couple, even if the two hotties are just close friends.

While Mario took care of his hosting duties for Extra at The Grove, his BFF Eva stopped by for a few good laughs and to show off her adorable yellow dress.

The sexy Desperate Housewives star has been dating beau Eduardo Cruz for the past nine months, but as we reported yesterday, Eva is not engaged ... yet. We have a feeling Mario knows Eva's relationship secrets.

We'll be watching to see if Eduardo ends up putting a ring on it!

Christina Aguilera chatted with Extra's Mario Lopez at the Grove Friday. The Voice star held mini-auditions for the first 50 people who signed up for the "Extra X-tina Sing-Off." The winner received two tickets to a taping of The Voice.

Maybe the lucky winner will sit in on the extra episode of the talent competition show just ordered up by NBC. The Voice is taking a cue from Dancing With the Stars and adding a "results" show to air June 22, with the finale airing June 29.

In other Aguilera news, click through to find out who Xtina was rumored to be recording a duet with ...

Jennifer Lopez sparkled in a Zuhair Murad paillette jumpsuit at the pre-release party for her new album Love? at The Grove in LA Friday.

Extra's Mario Lopez interviewed the American Idol judge about her latest single I'm Into You.

J Lo's a busy women these days ... she and hubby Marc Anthony are preparing to launch their own talent competition reality show called Q'Viva! The Chosen, in which they'll tour Latin America in search of undiscovered musical talent.

At last night's event, she waved to fans from the top of a double-decker trolley that runs through the outdoor mall ...