FC Barcelona defender Gerard Pique showed off his strength as Shakira's boyfriend carried his two sons in his arms while on a family day outing in the capital city of Catalonia on Wednesday.

"Gerard held both Milan, two, and eight-month-old Sasha in his arms as Shakira walked alongside them, full of love for her little brood," said Daily Mail.

"The Whenever, Wherever singer still looked flawless as she was makeup-free and kept it casual as she played with her infant," it added.

Later that night, Shakira and boyfriend Gerard Pique had a date by watching "The Innocence+Experience" concert by U2.

She shared a selfie with Gerard Pique on her Instagram of their night out as she wrote, "At U2's awesome concert! Shak."

For the family outing, Shakira showed off her slim figure in a printed sleeveless blouse and ripped black jeans which she paired with black ankle boots.

The "Hips Don't Lie" singer has managed to shed off her post-baby weight after the birth of her second baby with boyfriend Gerard Pique by training with Anna Kaiser.

In a previous interview with the instructor to E! News, Anna Kaiser dished on how Shakira shed off the post-baby pounds.

"Everyone is different, but Shakira came four to five times a week. The body is exhausted from birth and bonding with the baby, so each week is different after pregnancy," she said.

Although Shakira and boyfriend Gerard Pique have been together more than four years now, the singer is in no hurry to get married.

"When you feel complete you don't need to get married, and you don't think about it. Whatever, he is mine now," she told Primer Impacto.

In another interview, Shakira said that Gerard Pique can be "very territorial."

"He no longer lets me do videos with men, well, I have to do them with women," she said. "It's more than implied in our relationship that I can't do videos like I used to. It's out of the question - which I like, by the way."