"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 People.com.

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

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.

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?