She may be the world's top tennis player and the winner of multiple Grand Slams but Serena Williams was left giggling like a schoolgirl when she talked about meeting Prince William,

Serena was in the middle of a mundane press conference after beating Carla Suarez Navarro in the Australian Open third round on Saturday when someone asked her about meeting the prince when he was at the tennis two days ago.

She immediately lit up.

"It was super cool -- Prince William was really dapper and suave. You know, he was just basically, shazam," she said with a laugh.

"I wasn't really nervous to meet him, he was my age. I kind of always wanted to meet him, so it was cool."

Serena said she joked with William about their respective siblings.

"I told him that I might like his little brother better because he's the little brother, and he laughed and said he might like Venus better because she's older," she said.

"So we just had a little joke about that."

Asked if she and Venus should consider a double date with William and Harry, she said "Not unless Leo is there," revealing her crush on Hollywood heartthrob Leonardo DiCaprio.

"Every time I see Leonardo DiCaprio I get totally speechless. Every time I'm like, Hi."