Dakota Meyer says his pregnant wife Bristol Palin is "the most amazing woman."

The 28-year-old Marine Corps veteran shared a photo of Palin getting an ultrasound Wednesday and gushed about the 26-year-old television personality in the caption.

"I couldn't ask for a better person to be the mother of my children. She's the most amazing woman on earth and I'm so glad she chose me. Thank you for being my wife @bsmp2 #mywifeisamazing," he wrote on Instagram.

Meyer already shares 15-month-old daughter Sailor Grace with Palin, who is also mom to 8-year-old son Tripp Mitchell with ex-fiance Levi Johnston.

The couple confirmed in December that they are expecting again in the spring.

"We are so excited to announce that our family is expanding!" the pair said. "God has blessed us so much; we are thankful for His grace and new beginnings. A springtime baby in the Meyer home and we can't wait!"

Meyer and Palin married in June after calling off their first engagement in 2015. The television personality announced in January that she and Meyer are having another daughter.

"Dakota and Tripp are officially outnumbered," she wrote. "So excited to let you all know, ITS A GIRL!!"

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Palin is the eldest daughter of 2008 vice presidential candidate and former Alaska governor Sarah Palin.

In addition to appearing on her mom's show, "Sarah Palin's Alaska," she also competed on "Dancing with the Stars" and starred in her own short-lived "Bristol Palin: Life's a Tripp" reality series.