Ouzounian, 28, smiled for the cameras as she was spotted wearing blue jeans and a sleeveless white top, and carrying a blue leather bag.
Affleck, 42, has denied having a romantic relationship with Ouzounian, who began caring for his and Garner's three children – Violet, 9, Seraphina, 6, and Samuel, 3 – this past spring.
However, she has claimed to friends that the relationship did become intimate, multiple sources have confirmed to PEOPLE. "Christine is in love with him," one friend said.
Ouzounian was seen at the Hotel Bel Air later on Wednesday, where, according to a friend, she claimed she and Affleck had trysts.
Garner was still in the Bahamas with her children and was "livid" when she found out about the alleged affair, a friend of Ouzounian has told PEOPLE.