The pair chatted with parents and cradled infants, with Simmons calling one of the newborns "baby Gene" and saying: "I think this baby's humming Rock And Roll All Night."

The pair visited the Mount Sinai high-risk unit in support of Rock N' Roll Stroll - a day of events aimed at raising money for the unit. The inaugural event will be held on September 28 and is also supported by Slash, David Bowie and Elton John.