Avril Lavigne answered the age-old question, “Can exes be friends?” over the weekend when she invited her ex-husband, Sum 41’s Deryck Whibley, to the stage at the MGM Grand Garden Arena in ...

Water under the bridge for Avril Lavigne and her ex-husband Deryck Whibley. Lavigne, 39, joined Sum 41's Whibley, 44, on stage at the MGM Grand Garden Arena to perform a duet of his band's "In Too ...