Ashlee Simpson better listen the lyrics to "Boyfriend," 'cause girlfriend's got some major jealousy issues herself! Last weekend, she was in Chicago with BF, Pete Wentz, and whenever a female fan would try to take their picture with Petey, Ash "got whiny and dragged him away," a spy tells Page Six.

Perhaps she just didn't get the message of the song she sings -- lip-syncing will do that to you.