Kim Kardashian West wishes that Serena Williams' "silly side" could be more visible to the public.
The reality TV star has been friends with Serena for 15 years and believes the 23-time Grand Slam winner's true personality is too often hidden from view.
"I wish people could see her silly side," Kardashian West told the September issue of Vogue.
"She is obsessed with karaoke, which personally is my biggest fear in life. I remember a dinner in San Francisco before a DNC fund-raiser. Serena sang, Obama sang, Kanye sang. It was legendary.
"She gives herself those moments - it's how she recharges. Serena's the girl you can call and say anything to. She'll never judge you, and she's never too busy for you. Oh, and she can keep any secret."
Another celebrity friend of Serena, the actress Meghan Markle, has also talked up the pregnant Australian Open champion's talent behind the mic.
"She will be an amazing mom," Markle told Vogue. "The very best, because she is so attuned to balancing strength and sensitivity. Plus, given that she is pretty epic at karaoke, I think she'll put her signature Serena spin on singing lullabies for the baby. I can't wait for that!"