Enjoy the pictures of Canadian rock-pop singer Avril Lavigne seen giggling with a female friend and rocking a sexy sailor Halloween costume while going for dinner together at BOA Steakhouse in Beverly Hills. Avril who was wearing a short white dress, leather boots and a sailors hat was spotted laughing and joking with a friend but earlier this week was caused embarrassment by her ex husband Deryck Whibley who was seen dressed as a spoofed version of her for Halloween.