Retna Ltd. 1 / 4

Chelsea Clinton has announced that she is engaged to longtime boyfriend Marc Mezvinsky.

RELATED VIDEO: Chelsea Clinton Gets Engaged

According to ABC News, they sent an email to friends on Friday, Nov. 27.

It read: "We're sorry for the mass email but we wanted to wish everyone a belated Happy Thanksgiving! We also wanted to share that we are engaged! We didn't get married this past summer despite the stories to the contrary, but we are looking toward next summer and hope you all will be there to celebrate with us. Happy Holidays! Chelsea & Marc."

See which stars are wedding next!

Clinton spokesman Matt McKenna told ABC News he believed the couple became engaged on Thanksgiving in New York.

See unforgettable celeb wedding pics!

Clinton, 29, and Mezvinsky -- the son of former Rep. Ed Mezvinsky, D-Iowa, and former Rep. Marjorie Margolies-Mezvinksy, D-Penn. -- have been close since their teens when their parents worked in D.C.

See Hollywood's longest relationships!

They got even closer when they both attended Stanford University. Rumors surfaced earlier this year that the two were planning to wed in August.

See 2009's most romantic celeb couples

More on Wonderwall:

Become a fan of Wonderwall on Facebook

Follow Wonderwall on Twitter