Denise Richards returned to Instagram amid her divorce from Aaron Phypers. "Happy Birthday, Mom in Heaven," Denise, 54, captioned her social media post on Sunday, July 20. "You would've been 72 today. We miss and love you so much." The reality star shared two photos to honor her late mother, Joni Richards. The first image showed Denise and Joni holding a young Sami Sheen and Lola Sheen. The second was multiple photos of Joni when she was younger. (Denise's mom died of cancer at age 54 in November 2007.) Sami, 21, shared a message of support for her mom in the comments section.