has marked an incredibly bittersweet occasion as she made a heartfelt tribute on what would have been her mother's 68th birthday.MORE: Denise Richards' family home after fleeing California fires – photosThe Real Housewives of Beverly Hills star lost her mom, Joni, in November 2007, following a battle with cancer.WATCH: Denise Richards celebrates birthday with sumptuous cakesTo mark her late mother's birthday, Denise posted a beautiful family photo of her and her mom, as well as her sister, Michelle, and four of their children.Denise's third daughter, Eloise, is missing from the photo as she hadn't been born yet.Posting a heartfelt tribute, Denise wrote: "Mom happy birthday… what would have been 68.
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