Adrienne Bailon and her longtime boyfriend are headed down the aisle.

On Thursday, Bailon announced her engagement to Roc Nation executive Lenny Santiago. She and Santiago, who is the Senior Vice President of Artist Management at the music company, started dating after she split from Rob Kardashian in 2009.

"I am so excited to be marrying my best friend," Bailon told Us Weekly. "There's nothing like having someone that makes you laugh, that encourages you, and motivates you ... He's such an incredible person and they say there's always a great man behind a great woman and I say the same for him. He's been that great motivation behind everything I do."

The news came as a surprise to her co-hosts on "The Real." E! News obtained a clip from the show set to air Monday. Bailon made the big reveal to her shocked co-hosts and the audience by flashing her diamond ring.

Santiago proposed to her at a restaurant in upstate New York in front of their loved ones.