Jennifer Lopez and Casper Smart’s Dancing Date Night

Matt Donnelly
OMG Relationships
View photos

For the average couple, some casual shopping, dinner, and a movie or a home improvement project sounds like an ideal weekend activity.

Jennifer Lopez and Casper Smart aren't your average couple.

The diva and her dancer beau hit the MGM Grand Hotel for the grand opening of Hakkasan Las Vegas, a multi-level den of music, mingling, and plenty of stars.

Saturday's opening fete saw a cocktail hour hosted by GQ magazine, where J. Lo and her man strolled the red carpet arm-in-arm.

As a private preview went down the night beore in the club's "Kill Bill"-inspired Ling Ling lounge, there was plenty of anticipation for Saturday's big show featuring DJ Calvin Harris.

Actor Tom Welling toasted his birthday the same night, with his actor pals Mark Salling and Ryan Rottman.

Another cute couple, Vanessa Hudgens and Austin Butler, stepped out for Harris's set as well, which raged well unto the early morning hours.

Back in Hollywood, another star pair marked the weekend's start with some laughs for a good cause.

Seth Rogen and wife Lauren Miller presented "Hilarity For Charity" on Thursday at the Avalon Theater, featuring stand up comedy and a live auction to raise funds for The Alzheimer's Association.

Featuring sets from Kevin Hart, Mindy Kalling, Garfunkel and Oates, Billy Eichner, and Nick Kroll, guests enjoyed Ciroc cocktails and free barbecue from West Hollywood's Baby Blues.

One of the evening's biggest targets was yet another celebrity couple: Reese Witherspoon and Jim Toth.

"Yes I got a DUI and no you won't judge me," Hart (who was arrested in mid-April) told the crowd, "Reese asked them, 'Do you know who I am?'"

Hart intimated that if he asked the same thing, "there'd be a billy club behind that so fast."

After miming out getting beaten with the stick, Hart joked, "What? You ha'vent seen 'Soul Plane?'"

omg! can report that Hart did drive himself home from the event, but in the perfect condition to do so. We don't think he wants another date night with the law.

More Celebrity Features on Yahoo!: