Former BEVERLY HILLS, 90210 star Brian Austin Green has proposed to his girlfriend of two years, actress Megan Fox. The 33-year-old star, who played Tori Spelling's love interest DAVID SILVER on the hit series, was previously engaged to co-star Vanessa Marcil. Green and Marcil have one son together, KASSIUS, four. Fox, 20 has appeared on the sitcoms HOPE + FAITH and TWO AND A HALF MEN and appears in the upcoming Transformers film. Green tells American publication Us Weekly that no official wedding date has been set and that the couple may decide to elope.