Kim Kardashian and Kylie Jenner match in string bikinis: ‘You my twin’

Twinning is winning.

Kylie Jenner heated up the ‘gram when she posted a new snapshot with her big sister, Kim Kardashian, yesterday — and despite their nearly 20-year age difference, the duo looked practically identical as they matched in sexy black bikinis.

“You my twin,” the Kylie Cosmetics founder captioned her post as the sisters both rocked dramatic poses on a lounge chair as the sun set above a tranquil pool.

Kardashian, 42, appeared to be wearing her own matching top ($45) from Khloé Kardashian’s Good American label.

“Always and Forever,” big sister Kim commented on the pic, while Khloé left a twinning emoji on the post.

While some fans were loving their sister moment, others were a bit more critical of Jenner’s “twin” claim.

“Because you go to the same doc,” one fan wrote, while another said, “Crazy how their physics [sic] look crazy similar and yet kim is 40 something lol.”