Stars were celebrating the holiday spirit on Twitter this week. Bar Refaeli sent tidings of joy in a bikini from Brazil, and Hilary Duff showed off her favorite gift this season. Matthew McConaughey and Camila Alves got engaged, while Cash Warren and Jessica Alba brought Brad Goreski over to meet her parents — click through to see all the pics, and don't forget to follow PopSugar on Twitter for exciting news and photos!
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