Last week, Big Time Rush, Ellie Goulding and OneRepublic attended the Ornaments for the Park Auction during the 89th National Christmas Tree Lighting Ceremony in Washington D.C. The event was sponsored by the W Washington Hotel and the National Park Foundation, and the 'Music Sounds Better With U' quartet, the British 'Lights' songstress and the 'Good Life' group all posed for pictures at the event and later signed an ornament that will be auctioned off.

The ornaments that Big Time Rush, Ms. Goulding and OneRepublic signed were made by Tiny Jewel Box and they are currently on display in the living room at the W hotel in D.C. The ornaments are one-of-a-kind pieces and will be available for fans to bid on up until Dec. 12. All of the proceeds from the ornaments, which have "vintage decoupage images from the very first Lighting of the National Christmas Tree in 1923," will go to the National Park Foundation.

If you would like to bid on one of the celebrity-autographed ornaments for your Christmas tree, click here to visit the official Ornaments for the Park auction site. Remember, you can bid up until Dec. 12. In the meantime, scroll through these pictures of Big Time Rush, Ellie Goulding and OneRepublic at the event and get in the Christmas spirit. Happy holidays!