Emily Ratajkowski let it (almost) all hang out when she hit the beach in Mexico [1] with a friend on Monday. The model and actress showed off her butt in a sexy brown one-piece [2] and looked totally at ease as she relaxed on a lounge chair, beer in hand — are you jealous yet? Emily is clearly having a great time south of the border; last week, she shared a photo of herself totally naked [3] while laying in a rock pool. The one downside to the trip? She did get a sunburn, but hey: you have to take the good with the bad (and red). [4]