Newly-engaged couple Jenny McCarthy and Donnie Wahlberg were at jewelry company Pandora’s pre-Mother’s Day dinner in New York Wednesday night. As we mentioned earlier this week, Wahlberg is executive producing the TV Guide Network’s “Rock This Boat: New Kids on the Block,” a show filmed on the New Kids cruise. No word on whether McCarthy will join the group on the water. . . . In other New Kids news, Jordan Knight and Backstreet Boys singer Nick Carter are recording together as Nick & Knight. You can already buy $30 Nick & Knight tank tops online, and the duo will tour this fall (hitting the Citi Emerson Colonial Theatre in Boston on Oct. 8). New Kids on the Block and the Backstreet Boys performed together at Fenway Park in 2011.