The 46-year-old wore a belted swimming costume from her own collection at Selmark.
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Mum-of-four Pilar is married to football ace Sergio Ramos, who plays at centre-back for La Liga club Sevilla.
On her birthday last week, Sergio said: “Thank you for being the best mother and the best example of love for everyone.”
Mum-of-four Pilar previously revealed that the couple have sex every day.
When asked how often she had romped with her husband, the stunning brunette replied: “We do it every day, except for the days when I am in Madrid.”
She commuted between Paris and Madrid when Ramos joined PSG, although he rejoined Sevilla last year.
Told by the shocked host of chat show La Resistencia they were like Avengers superheroes having sex so often with four youngsters in the house, she added: “My children are in bed at 9.30pm. Sex is life.”
She insisted the fact they had four kids had no impact on their sex life.
Rubio tried to turn the tables by asking host David Broncano about how often he did it – but was told he had no children so there was no comparison.
In her tell-all interview, Rubio also claimed she had just £46,000 in the bank.
Seeing the admission was causing as much shock as her confession about sex with Sergio Ramos, she added: “I’m talking about the current account which is the one I saw.”