Kelly Clarkson celebrated her 35th birthday at Universal Studios in Florida on Monday with family and friends. The trip to Orlando was a surprise girls getaway she learned about during a scavenger hunt with friends on Friday. "Woke up this morning to a birthday scavenger hunt that ended with an anagram!! Best surprise ever!" she posted on Instagram. The "Since U Been Gone" singer shared a photo on Instagram Monday from her trip -- a selfie with her 1-year-old son Remington. She captioned the post, "Thank you @universalorlando for the most magical birthday!!! It was the greatest surprise to have my entire group adorned in Harry Potter gear!!!" Clarkson is also mother to 2-year-old daughter River Rose, who she shared a picture of on Twitter Monday. "River Rose is loving\/hating mama's birthday," she posted.