Usher

Usher, Stylist Girlfriend Are Engaged

02/23/2007 at 04:40 PM EST

Usher is engaged to his stylist girlfriend, Tameka Foster, a source confirms to PEOPLE.

The first hint that the two had decided to tie the knot came on Monday, when the R&B singer was at the NAACP Theatre Image Awards in Beverly Hills. Onstage to accept his Spirit Award, he thanked Foster, referring to her as his "fiancée."

Usher's rep could not be reached for comment.

This will be the first marriage for Usher, 28 (real name: Usher Raymond), and the second for Foster, 37, who was previously married to Noontime Music cofounder Ryan Glover.

Foster is a stylist who has worked with Lauryn Hill and Toni Braxton. She was also Usher's stylist on his 2004 Truth Tour, Entertainment Weekly reported at the time.

In August, Usher spoke to PEOPLE about his performance on Broadway in Chicago and likened stage work to "a monogamous relationship."

"Doing anything else, like acting in Hollywood – which is great – it's like a one-night stand," he said. "You do it and then you keep moving."