Rumer Willis was thrilled to turn 21 because it meant she could gamble.

The 'Sorority Row' actress celebrated her landmark birthday on August 21 with a party in Las Vegas so she could lay down some bets.

She explained to website Dark Horizons: "It was wonderful. I got to gamble. I played blackjack my first night, and I won a little money, so that was really fun. But other than that, not really that much has changed."

Rumer spent the evening at the city's Tau restaurant and nightclub, where she was joined by 55 friends and family, including her parents Bruce Willis and Demi Moore.

She said at the time: "To be in Vegas on your 21st birthday, could you ask for anything better? You get to be in the centre of all the things that you get to try out when you're 21."

Rumer plays Ellie in slasher film 'Sorority Row', and has revealed she had an input into her character's costume.

She said: "The glasses are actually mine, and I had brought them to a fitting. I just wanted to add them. But they ended up being more trouble, because every time I would cry, the lenses would fog up."