That was quick!

Jamie-Lynn Sigler is engaged to her Washington Nationals baseball player beau Cutter Dykstra, and she confirmed the happy news by tweeting this pic showing off her gigantic rock with the caption, "So this just happened..."

What an exciting time!

"Jamie couldn't be happier. Cutter is the perfect guy for her. Although they have only been together for a year, they both know that this is it for both of them. They are both on cloud nine as are their families and friends," a source told Us Weekly.

This will be the second marriage for the actress, who was previous hitched to manager A.J. DiScala for two years. She also dated Entourage star Jerry Ferrara and football player Mark Sanchez before finding her Prince Charming.

Congrats you two!