Will Smith and his wife Jada Pinkett Smith put on a united front on Sunday night (10Nov13) to celebrate the 21st birthday of the actor's eldest son amid new reports of marriage trouble.

Bloggers and gossips went crazy last week (ends08Nov13) when images of Smith and his Focus co-star Margot Robbie posing for cheeky pictures hit the Internet, prompting fresh speculation about the state of his 16-year marriage.

Robbie, who pulled up her top to reveal her bra in one of the silly shots, has since taken to Twitter.com to dismiss chatter about a romance with her co-star, and Smith and his wife were all smiles as they posed for family photos over dinner at Hakkasan in Las Vegas on Sunday.

The couple was joined by Will's 21-year-old son Trey and his mother Sheree Zampino, teenage siblings Jaden and Willow and a group of close to 50 family members and friends at the top restaurant.

A source tells Us Weekly that Will never left his wife's side and the pair was "in high spirits".

Reports suggest Trey showed off his DJ-ing skills at the party.