Fashion Accessories Tech From Kourtney Kardashian's Post-Baby Debut to Blake Lively's Photo Op, the Best Weekend Celeb Instagrams By Rita Kokshanian Rita Kokshanian Rita Kokshanian is a Los Angeles-based writer and editor who covers celebrity, fashion, beauty, and lifestyle. She was previously an Assistant Editor for InStyle and is currently the Senior Copywriter at The Grind. InStyle's editorial guidelines Published on December 29, 2014 @ 11:29AM Pin Share Tweet Email Photo: Kourtneykardash/Instagram, sofiavergara/Instagram Christmas may be over, but that's not going to stop the stars from celebrating! This weekend celebs from all over the country stepped out for birthdays, photo shoots, vacations, and more. Kourtney Kardashian made her first appearance since giving birth to her third child, a son named Reign Aston Disick. The reality starlet glowed alongside sisters Kim and Khloe at mom Kris Jenner's Christmas party. Meanwhile, Sofia Vergara celebrated boyfriend Joe Manganiello's 38th brithday in Hawaii. But they weren't the only ones having fun—take a look at our 10 favorite celebrity Instagrams from the weekend below! 1. Kelly Ripa 2. Alessandra Ambrosio 3. Gwen Stefani 4. Rosie Huntington-Whiteley 5. Sofia Vergara 6. Blake Lively 7. Lea Michele 8. Lena Dunham 9. Chrissy Teigen 10. Kourtney Kardsahian