We spotted the B2M singer in Bev Hills Tuesday during the TMZ Celebrity Tour, and he was cool enough to hop on our bus to chat with fans about his R&B group's peaks and valleys.
Shawn says, back in the day, their team had reached out to Amy suggesting she do a song with Boyz II Men. You gotta see him explain how that went over with British singer -- but, let's just say at least they made her laugh.
That being said, lots of other artists -- including contemporary rappers -- are down with the group's hits, and Shawn told us why they're open to working with everyone in the industry.
As you know, the R&B group, now consisting of Shawn, Nathan Morris and Wanya Morris gained international success in the 1990s.
They've won 4 Grammys, and Billboard recognized them as the biggest boy band from 1987 to 2012 -- and, btw, they're on tour this summer.
BTW, Shawn grabbed his guitar and gave the bus a little show, singing a solo acoustic version of "I'll Make Love To You" ... which spent 14 weeks at #1 back in 1994. Still, one of the biggest slow jams ever!