Katharine McPhee, 38, and husband David Foster, 73, perform at the CBS Holiday show at The Grove

Katharine McPhee and husband David Foster looked loved-up as ever when they performed together at a CBS Holiday show at The Grove in Los Angeles on Sunday.

The actress, 38, looked loving every inch as she held her son Rennie before taking the stage with the music mogul, 73.

The dynamic duo, who will release a Christmas album in a few weeks, treated the audience to some seasonal songs during the event.

David provided his wife with piano accompaniment as she enjoyed the spotlight and showed off her vocal talents.

Katharine looked glamorous in a white fitted dress with puff sleeves, paired with silver heels.

She opted for a bronzed makeup look with a nude lip, as she styled her dark brown locks into a neat bun.

Meanwhile, David looked good in a black blazer and crisp white shirt, paired with matching trousers and a Louis Vuitton scarf.

David and Katharine met in 2006 when he served as a mentor to a group of contestants, including her on American Idol.

The season that brought them together aired from January to May 2006, during which time Katharine turned 22 and David turned 56.

Over the course of his five marriages, David has welcomed six children: Allison, 52, Amy, 49, Sara, 41, Erin, 40, and Jordan, 36, and Rennie, one.

Katharine and David have attracted a lot of attention due to their age difference, which is so great that she is younger than four of her stepdaughters.

Nick Carter and sister Angel seemed to be trying to embrace the holiday spirit when they got together at the event.

On November 5, Aaron was found dead in his bathtub at his home in Lancaster, California.

He was cremated and his ashes will be kept by his twin sister, Angel, according to TMZwho obtained the singer’s death certificate.

The document says his mother, Jane, was the first to notify authorities of her son’s tragic death.

The death certificate does not list Aaron’s cause of death.

Former child star Aaron spent his life with drug addiction. it was reported that law enforcement found prescription pills and cans of compressed air in the bathroom where he died. He claimed he was sober for nearly five years before his death.

Nick and Angel were seen hugging Lance Bass from ‘N Sync inside and smiling as they chatted with the singer, who was holding his baby daughter Violet.

After her brother’s tragic passing, Angel paid a heartbreaking tribute to her brother on Instagram.

“To my twin brother… I loved you very much. You will be very much missed. My funny, sweet Aaron, I have so many memories of you and me, and I promise to cherish them,” she wrote.

Angel continued, “I know you are at peace now. I will carry you with me until the day I die and see you again.’

Aaron’s brother, former Backstreet Boys member Nick, also wrote about his brother on social media.

He wrote: ‘Very grateful for the deluge[ing] of love and support for my brother. In his memory, a donation fund has been started to benefit @onoursleevesofficial, a major children’s mental health charity that helps families across America,” Nick said.

The singer posted a link to the On our sleeves website where fans can make donations.

Nick also said, “Thank you for choosing to celebrate the impact of Aaron Carter’s life with a gift of hope. By honoring Aaron you are helping Nick, Angel and their family help others.”