TEEN Mom star Kristina Shirley's reclusive daughter, Karly, has been seen for the first time in a birthday post shared by her sister, Leah.

The 18-year-old is Kristina's eldest daughter from her first marriage, and she has stayed out of the limelight.

However, Leah, 16, gave a shoutout to her big sister in an Instagram post , in honor of her special day.

She posted a slideshow of photos of the duo from their childhood years, as well as recent ones, showcasing the tight bond between the stepsiblings.

Fans pointed out that Karly bears a striking resemblance to her mother, sharing the same brunette locks, freckles, and facial expressions.

"HAPPY 18TH BIRTHDAY SISSY!!! Remember to have no regrets with wherever life leads you from now on, I love you so much, I hope you had the best day e

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