Credit: Jeffrey Mayer/

Sarah Palin isn't the only one surprised by her daughter Bristol's on-again engagement to Levi Johnston.

Kathy Griffin -- Johnston's date at the 2009 Teen Choice Awards last August -- was taken aback as well.

"Oh y did I trust my heart 2 a 19 yr old ice-fisherman/babydaddy from Wasila?" the comedienne, 49, Tweeted on Wednesday.

"Like Britney I'm putting myself on a 5150 psych hold," she cracked, referring to the involuntary psychiatric hold in which Britney Spears was placed in 2008.

Soon after their Teen Choice date, Griffin joked that she and Johnston were embarking on a romance, cooing about his "chocolate beautiful eyes" on CNN.

Bristol, 19, and Levi, 20, reveal exclusively in the new Us Weekly that they got engaged again two weeks ago.

The couple reconnected three months ago while working out custody arrangements for their son Tripp, 18 months. "I really thought we were over," Levi tells Us Weekly. "So when I went, I had no hope. I think we both just started talking -- and then we took Tripp for a walk."