Avril Lavigne and her ex-husband Deryck Whibley reunited yesterday afternoon while hanging out on a yacht docked off the coat of St. Tropez. There were plenty more Avril Lavigne bikini sightings as well, since she wore the two-piece and a tiny wrap to say hi to her ex and some of his guy friends. Avril has been in the South of France for the past week enjoying her vacation by swimming in the Mediterranean and eating at local hot spots like Club 55. Despite the adults-only fun, she also showed her youthful side by playing in the water with a Hello Kitty body board. Avril and Deryck split in late 2009 before finalizing their divorce in November 2010. She's still going strong with Brody Jenner, but it seems Avril and Deryck are on good terms as well.