It’s Monday and you have to go back to work. The weather is probably cold and wet, so you wish you could crawl back in bed. What can perk up your spirits like pictures of gorgeous women half-naked? That’s why we’re declaring this Supermodel Monday, and presenting some of the hottest cuties to brighten your day. For starters, here’s Irina Shayk in some seriously sexy bikinis. See more hot shots after the jump!