Scarlett Johansson gave boyfriend Ryan Reynolds her wisdom tooth for his birthday

The 'Smokin Aces' star turned 31 on Tuesday but Scarlett held an early celebration for him at Los Angeles' Chateau Marmont hotel last week where she presented him with her tooth, which had been dipped in gold and made into a necklace.

A source told E!: "She'd just had her wisdom teeth removed, so she had one dipped in gold and strung on a necklace for him."