David Foster Celebrates 68th Birthday With Girlfriend Katharine McPhee, Daughters And Stepsons

David Foster has turned another year older, and he celebrated his special day with the most important people in his life.

On Wednesday, Foster, who turned 68 years old, celebrated his birthday with his girlfriend, Katharine McPhee, and his children. Foster's daughters, Erin Foster and Sara Foster, as well as his stepsons Brody Jenner and Brandon Jenner, gathered together to celebrate the "Asia's Got Talent" judge's special day.

The group headed to West Hollywood hot spot Craig's for Foster's birthday. According to an insider, the restaurant is the birthday celebrant's favorite in the city. His daughters helped arrange their dad's evening party, E! News reported.

"It was a really nice dinner," one source said of the gathering. "Everyone was joking around and giving him a hard time about his age, but David was loving it."

For their menu, they enjoyed Craig's famous dessert, the chocolate pizza, as they sang the composer, "Happy Birthday." Everyone had a great time, especially the celebrant and his girlfriend. The insider added that the "Terrified" singer looked "happy" and was "by [Foster's] side the entire time." Meanwhile, Foster was very affectionate to his girlfriend, wrapping his arms around her from time to time.

McPhee and Foster were first seen showing off PDA at a dinner party in May at Nobu in Malibu. According to an eyewitness, Foster grabbed McPhee's face and kissed her on the cheek several times. The "American Idol" alum did the same to Foster.

"David and Katharine were very intimate during their dinner," an onlooker told E! News. "David was seen grabbing Katharine's face and kissing her cheek several times. Katharine was doing the same to David's face and they were acting as if they were a couple."

In September, Erin confirmed her dad and McPhee's relationship when she called the "Smash" star her "stepmom." Erin shared a snap of Foster and McPhee from the Grammy Museum Gala honoring her father. In the caption, she wrote: "Excited about my new step mom."

In October, Foster's divorce from Yolanda Hadid was finalized. However, the exes still need to come to an agreement over spousal support, property and attorney's fees, Entertainment Tonight reported.

What can you say about Foster's birthday celebration with McPhee and his children? Drop a comment below.