Meghan Markle made a "joyful" appearance at the Highbrow Hippie launch party at Gjelina in Venice, California, on Thursday, Nov. 14, a source tells PEOPLE

For years, Meghan Markle has been a supporter of Kadi Lee, the celebrity colorist responsible for her chestnut brown locks. Now, that support has become a part of Meghan’s investment portfolio. On Thursday,

Hair is important,” Julia Roberts, who Lee recently took blonde, calls to tell me the day before the launch, “and when you know that is when you lose it.” Roberts’s hair is in excellent shape, thanks to Lee.

InStyle reported yesterday that Meghan Markle is an investor in the hair and wellness company Highbrow Hippie, founded by her colorist Kadi Lee and Myka

After Lee spoke about how her friendship with Meghan influenced the evolution of her business, the Duchess of Sussex said, "I was using boxed dye when I met her!" eliciting laughs