04/17/2009 AT 03:00 PM EDT
would have been awkward! Jessica Simpson
just missed ex John Mayer
while dining at Katsuya Hollywood
with dad Joe
, mom Tina
and a posse of seven female friends. While the singers never crossed paths (Mayer stopped in earlier) Simpson did come face to face with another
musician ex: Adam Levine.
"He and Jessica briefly said hello and enjoyed their meals separately," says an onlooker of the two.