Nicole Richie and Joel Madden are believed to be engaged.
A local radio DJ announced the happy news after the Good Charlotte frontman performed with his band at the Hot 99.5 Lil' Black Dress Party at Virginia's Clarendon Ballroom on Friday.
Hot 99.5 morning show host Kane came onto the stage following the acoustic show and shouted to the crowd: "He got engaged yesterday. Congratulations, Joel!"
Joel - who is expecting his first child with Nicole - did not say anything but waved to the audience before making a hurried exit.
Kane revealed: "I offered my personal congratulations to Joel earlier in the night. He said, 'Thank you so much.'"
"They're very excited about the baby and the wedding, but they want to keep their personal life personal."
Last week, Joel let slip his plans to pop the question to Nicole - who is four months pregnant - during an interview on TV show 'Live!' when host Regis Philbin questioned him about his love life.
Regis said: "I hear you're going to present Nicole with a little engagement ring or something?"
Joel, who was on stage with his band ready to perform, replied: "Well I had been hoping it would be a surprise but I guess it's not now."