If at first you don't succeed, then try, try, try and try again.

Charlie Sheen is now engaged to former "adult entertainer" Brett Rossi. He proposed to her on Saturday after flying her to Hawaii on a private jet.

This will be the fourth marriage for the wacky Sheen. He first married model Donna Peele in 1995, but that union lasted all but one year.

In 2002, he tied the knot with Denise Richards, but she filed for divorce two years later while six months pregnant with their second child.

Brooke Mueller drew the title of wife #3 in 2008, but the marriage ended tumultuously in 2011.

For what it's worth, (and we're pretty sure, not much), sources close to Sheen are saying that he is confident this time it will be different, and he's taking things very serious this time.