The `Ace Ventura` actor is reportedly set to pop the question to his 30-year-old student girlfriend any day now.

A source said: "Jim is going to propose! He`s absolutely crazy about Anastasia and couldn`t be happier."

Twice-married Jim - who dated glamour model Jenny McCarthy for almost five years before splitting in 2010 - is said to have realised he was ready to marry again when he turned 50 in January - and believes Anastasia is the one for him.

The insider told Star magazine: "[She is] really smart, but what he likes best about her is her sense of humour. She makes him laugh.

"Jim confessed to Anastasia, `It`s not always easy being with me, in more ways than one`. But he added, `I promise to make it worth your while`."

The father-of-one was previously married to his `Dumb and Dumber` co-star Lauren Holly from 1996 to 1997, and to actress and waitress Melissa Womer from 1987 to 1995. They have one child, daughter Jane, 24, together. He has also dated `America`s Next Top Model` star Anchal Joseph.
sections: Celebrities