levibristolengaged.jpg Bristol Palin and Levi Johnston are engaged, and the couple tell Us Weekly that Sarah Palin had no idea ... until now. Surprise!

"We got engaged two weeks ago," Bristol tells the mag. "It felt right, even though we don’t have the approval of our parents." Bristol, 19, and Levi, 20 were previously engagement after the birth of their son Tripp in December 2008, but the plans were quickly called off and a bitter custody battle ensued.

Bristol and Levi reveal that they reconnected three months ago while working out a custody plan for their 18-month-old son. So what about getting the approval of mom Sarah? Bristol says, "It is intimidating and scary just to think about what her reaction is going to be. Hopefully she will jump on board."

What if she doesn't?