Cheating rumors? What cheating rumors?

Will Smith and Jada Pinkett-Smith wwere all smiles in Las Vegas this weekend amid rumors that Will cheated on his wife with "Focus" co-star Margot Robbie.

The two were in Sin City to celebrate Will's son Trey's 21st birthday. Their kids Willow and Jaden were also there.

The group started off the night with dinner, followed by a bash at Lavo sans Willow and Jaden, since they are under 21, said a partygoer. Trey, who is a DJ, spun tunes, and when "the clock struck midnight, Will jumped in the booth and got on the mic to wish his son a happy birthday," the spy said.