The former first daughter, 29, will wed longtime beau Marc Mezvinsky, a spokesman for former President Bill Clinton confirmed to ABC News Monday morning.
The couple sent out a mass email announcing the news Friday.
"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."
Clinton and Mezvinsky, son of former Rep. Ed Mezvinsky (D-Iowa) and former Rep. Marjorie Margolies-Mezvinksy (D-Penna.) -- were rumored to have walked down the aisle this past summer.