Miley Cyrus and Liam Hemsworth are engaged! Which celeb married too young?

"Life is beautiful," Miley Cyrus tweeted Wednesday morning. And why is she in such a good mood? The 19-year-old former Disney princess is engaged to 22-year-old "Hunger Games" actor Liam Hemsworth, the couple confirmed to

"I'm so happy to be engaged and look forward to a life of happiness with Liam," Cyrus told the mag.

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The Australian hunk popped the question on May 31 with a 3.5-carat diamond ring from jeweler Neil Lane, three years after he started dating Miley, People reports. The couple met on the set of "The Last Song" in 2009; at the time, Miley called Hemsworth her "first serious boyfriend." They've since broken up and gotten back together multiple times, according to reports.

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While we're happy for Miley, we can't help but wonder if she's a little too young and impulsive to be tying the knot. From Jessica Simpson and Avril Lavigne to Kate Hudson and Reese Witherspoon, let us know: Which celeb got married too young?