Rosie O’Donnell has signed on for a radio talk show on Sirius XM, joining the likes of Oprah, Martha Stewart, and Howard Stern this fall. She’ll interview celebrity guests, take calls, and blend pop culture with serious topics, the company says. Rosie Radio indicates the flagging satellite conglomerate’s determination to stay in the media game, the Daily News reports. (More Rosie O'Donnell stories.)