After a late Friday night performance with his band Good Charlotte at the Hot 99.5 Lil' Black Dress Party in Arlington, Va., Joel Madden was walking offstage when Hot 99.5 morning show deejay Kane announced to the crowd, "He got engaged yesterday. Congratulations, Joel!"

Joel Madden & Nicole Richie Engaged?

"We heard this morning," Kane told PEOPLE following Good Charlotte's 40-minute set. Crediting he got the word from "good sources," Kane said he hadn't seen Richie since hearing the news, but added he had offered his congratulations to Madden earlier in the night. "He said, 'Thank you so much,'" recalled Kane.

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"They're very excited about the baby and the wedding. They want to keep their personal life personal," he added.