Eva also shared a series of snaps of her fellow celebrity L'Oreal beauty ambassadors Jane Fonda, Cheryl Cole, Megan Gale and Doutzen Kroes, who all braved the bad weather for the annual film festival in the South of France.
The Latina bombshell and her British counterpart Cheryl appeared to get on famously, and the pair couldn't get over how similar they looked.
Eva wrote on the social networking site, "Me and my twin sister @cherylcole at Cannes!', with Cheryl re-posting the message and adding, "It was like looking at a prettier reflection, ha!"
Anne Hathaway, Britney Spears and Paris Hilton have all memorably suffered similar cringe-worthy red carpet malfunctions.
- Bang! Showbiz