4. Gwen Stefani

Price: $35 million*
Location: Hollywood Hills, CA

Gwen Stefani, known for her music, also made savvy property moves. She and Gavin Rossdale bought a Hollywood Hills mansion for $13 million in 2006. After their split, Gwen kept it, listed it for $35 million in 2016, then changed her mind. The estate boasts a pool, tennis court, guest house, and privacy, shielding the Comcast NBC star from unwanted attention.