Jill Scott's fiance playing here with Janet Jackson

Philly-raised drummer

"Lil" John Roberts

is engaged to one R&B diva,

Jill Scott

, but touring with another,

Janet Jackson,

with whom he'll perform Oct. 2 at the Wachovia Center. He's played for Jackson before and

» READ MORE: just left a tour with Scott to rejoin Jackson's

.

» READ MORE: Roberts

and Scott were engaged in June with Scott announcing the happy news on stage at Carnegie Hall after Roberts came out from behind the kit to give her flowers and a passionate kiss. The lovebirds have since gotten the other's first name tattooed on their necks, but we hear they're both so busy touring that they're having trouble planning the wedding. Roberts is a grandson of Hall of Fame boxer

Harold Johnson.