Cameron Diaz stuffed a whole burger in her mouth to impress Keanu Reeves while on a date.

The 'My Sister's Keeper' actress - who has recently been seen enjoying evenings with actors Jude Law, Leonardo DiCaprio and Jason Lewis - bemused onlookers at Los Angeles' Whisper Lounge restaurant with her unique flirting technique, showing the 'Speed' star how much food she could cram into her jaws.

A source said: "They looked very cosy. Cameron was stuffing her burger in her mouth and playing up to the fact she has a wide mouth. Keanu was laughing - it was strange to see him giggling like that as he's regarded as a bit serious."

The pair - who played lovers in 1996 movie 'Feeling Minnesota' - enjoyed cocktails at the eatery before walking arm-in-arm to a nearby cinema.

Earlier this week, it was claimed 36-year-old Cameron "couldn't stop touching" 'Sex and the City' actor Jason when they ate together at a sushi restaurant in Venice Beach.

An onlooker said: "Cameron and Jason were sitting in the corner of Shima totally wrapped up in one another. They couldn't stop touching each other. And we couldn't stop looking."