'Tis the season for partying a little too hard. Before you order another mojito at the office holiday party or down that third glass of vino at Thanksgiving dinner, this low-sugar cocktail (a fave of Alexandra's and Katrina's!) will lower your risk of an awful hangover ... not to mention dull, lifeless skin the next day: Tequila with club soda and lime. Ask for straight, fine tequila, and hold the sugar-filled tequila mix. "Also, here's a little secret of mine," says Alexandra. "I chug a full glass of water after every cocktail."