LOS ANGELES (TheWrap.com) – It sounded like Megan Draper was singing “Zubi Zubi Zu” to hubby Don on Sunday’s “Mad Men” season five premiere, but the French tune is actually called “Zou Bisou Bisou,” and actress Jessica Pare’s performance is now available on iTunes. The 1960s pop song — a hit for British actress and pop star Gillian Hills — was newbie Mrs. Draper’s (Pare) gift to Don (Jon Hamm) during his surprise 40th birthday party in the season’s opening episode. …