The Voice US judge kept it glam and glitzy as celebrated the show's top 12 contestants at Universal Studios Hollywood on Thursday night (7 November).
The 32-year-old was joined by fellow judges, Adam Levine, CeeLo Green, Blake Shelton and host Carson Daly.
Christina, who is mum to five-year-old son Max, was the leading lady and put her best foot forward as she posed for photographers. She wore an embellished sheer beaded top, which showed off her recent weight loss.
The 'Beautiful' singer teamed her simple yet chic outfit with black peep toe heels, and kept accessories to a minimum, wearing just large silver hoop earrings.
Sporting sultry waves and tousled hair, Christina completed her look with a slick of red lipstick and dark eye make-up.
Christina, who returned to The Voice US this year after taking a break for one season, recently said that she feels "sexier than ever".
In an interview on The Tonight Show With Jay Leno in September, she added: "I'm an artist, and expressing myself in a sexual way - no matter how that changes throughout the years - is something that has always come naturally to me."
Watch Christina's music video for 'Let There Be Love' below: