Tennis: Anna Kournikova shows off bikini body in Instagram video

Tennis beauty and mother-of-two Anna Kournikova has prompted a mixed reaction from her Instagram followers after showing off her ripped physique.

The 37-year-old, who gave birth to twins Nicholas and Lucy in December 2017, shared a behind-the-scenes video of a photography shoot where she danced on a table in a bikini and high heels.

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But fans were split over her trim body. "Why are u so skinny? R u ok?" one asked. "What happened to ur Muscular athletic body??" added another.

Anna Kournikova during the 2010 U.S. Open. Photo / Getty

Others thought Kournikova looked fantastic. "These people are bullies and morons. Beautiful," one wrote. "Wow!!! You dont even look like you had twins!!" added another.

Singer Suzie Del Vecchio wrote: "Gorgeous. Body goals!"

Anna Kournikova with one of her children. Photo / Instagram

"To people criticizing, it's not because she wants to be like that," was another response. "I'm a mom too and breastfeeding does not let you gain weight, stop criticizing and first worry about your affairs and look in the mirror before going around bothering other people."

Kournikova married singer Enrique Iglesias over a decade ago after appearing in the music video for his song Escape.

After the arrival of their twins the Spanish singer told The Sun the children did wonders for their sex life. "It's probably more sex now than ever. The sex has not diminished," Iglesias said.

"Like any couple, you still go through your ups and downs and it's not always perfect. But it is perfect in a way.

"It's incredible to watch her be such a great mother It's incredible to watch a mum do what she does, when a mother's instinct kicks in."