Richie is believed to have broken the news to his bandmates earlier this month.
A source told National Enquirer magazine: "He said, 'I asked Denise to marry me and she said yes!' He told everyone to get used to having Denise around."

Earlier this month, Denise Richards denied rumors she was engaged to her rock star boyfriend Richie Sambora.

Denise's attorney, Neal Hersh, denied the reports insisting they were completely untrue.

Hersh told gossip website TMZ.com: "There is no truth to any of the rumors that Denise and Richie are engaged. They are not."

Meanwhile, Denise is said to be locked in a new custody battle with estranged husband Charlie Sheen - over their pet dog.
The former Bond girl - who has two children with Charlie - let the 'Hot Shots' actor look after their dog Bettie for a period of time but now claims he is refusing to give her back.
The 'Wild Things' actress is blaming Charlie's new lover Brooke Mueller for conspiring to take the beloved dog from her.
A source said: "Denise thinks Brooke doesn't want Charlie to hand the dog back and she is furious."