Taylor Swift celebrated her 18th birthday at a party on Thursday night (Dec. 13) in the Nashville nightclub Lot 7. Guests included Kellie Pickler, Big & Rich's John Rich and new artists Lady Antebellum and Chuck Wicks. Swift chose a pink theme for the party. She wore a pink dress by Betsey Johnson and received a customized pink Chevy truck as a birthday gift from her label, Big Machine Records. Swift's "Our Song" reached No. 1 on the Billboard country airplay chart earlier in the week.