The '24' star, whose divorce from Elizabeth Kelly Winn was finalised last month, is reportedly planning to marry his new girlfriend Siobhan Bonnouvrier.
A friend of Kiefer's said: "Now that Kiefer is finally divorced, everyone is hoping he will marry Siobhan. Kiefer is a changed man and Siobhan is just the right woman for him. She is an amazing woman and has transformed Kiefer in just a few short weeks."
Kiefer - who served 48 days in a Los Angeles jail last December for drink-driving offences - has been "fit and focused" since he left prison and is ready to commit himself to the 35-year-old magazine director.
The source added: "She isn't the least bit bothered by his fame or wild past and the relationship has blossomed. They are both looking for long-term commitment so they are on the same page in terms of relationship goals. Everyone is hoping Kiefer finally settles down and find happiness with her. You can tell just by looking at them they are madly in love."
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