The event marked Foster's first public appearance since announcing her split from the 66-year-old musician.
"My Gigi, my Bella and my Anwar [are helping me through]," she said of her 20-year-old, 19-year-old and 16-year-old kids by first husband Mohamed Hadid. "My forever. I guess that's my only forever."
"Got my hair done today just to make the girls happy and I'm grateful to have a job and, you know, I hope to be moving forward to a bright future and just trying to get through it one day at a time," she shared.
Foster and David Foster were together nine years, and married in November 2011.
The couple revealed they are headed for divorce Tuesday, and the television personality's co-stars continued to show their support at the premiere.
"I'm still really shocked about it," Eileen Davidson told Us Weekly. "I have seen her and David together in the last season a few times, and it seemed fine ... Nobody knows what's going on with them."
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"[Husband] Harry [Hamlin] and I have sent our love and prayers, and you know, divorce is a very sad thing," Lisa Rinna added.
Foster's divorce comes amid her continued struggle with Lyme disease, which left her unable to read or write due to brain impairment as of January.
Son Anwar Hadid and daughter Bella Hadid are also diagnosed with the chronic condition.
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