Carter Reum has rubbished online speculation that his marriage to Paris Hilton is under strain.

The 45-year-old venture capitalist took to Instagram to assure fans that he and the socialite are "the happiest and best couple" in response to a video clip of Paris turning away from his kiss to pose for photos at the 2024 Grammy Awards.

Carter penned on the social media site: "Rest assured my wife @parishilton is my one in a trillion and we're the happiest and best couple.

"Although I appreciate everyone's amateur psychology takes as many called out, I just love giving my wife a kiss and she just hates her makeup being smudged on a red carpet."

He added: "It's not that deep everyone, and yes she loves me to death."

Carter and Paris got married in 2021 and The Simple Life star explained how Carter understands the "real" her.

The 45-year-old star - who has son Phoenix, three, and daughter London, two, with her spouse - wrote in a blog after their wedding: "I've lived a very unique life in the public eye over the last two decades and throughout the years, I was always searching for my partner.

"I was looking for my equal. Someone who wasn't fascinated with 'Paris Hilton' but instead, someone who saw the real me and loved me for me.

"I'm so proud of my love story with Carter, and even more excited that it's just beginning."

Meanwhile, the couple renewed their wedding vows on the Turks and Caicos Islands to mark Valentine's Day last month.

Alongside some behind-the-scenes photos from their big day, Paris wrote on social media platform X: "Five years later… and he still makes my heart skip a beat [tears and ring emojis]

"On Valentine's Day, in the turquoise waters of Turks and Caicos -- just days before my birthday -- my forever Valentine re-proposed, and I said YES all over again.

"But this time, we weren't just husband and wife. We were Mommy and Daddy. Phoenix and London watching the love that created them [heart emoji]

"Renewing our vows isn't just about celebrating five beautiful years -- it's about showing our babies that love grows, deepens, and chooses each other again and again.

"Five years down. Forever to go.

"Forever isn't long enough with you, Carter. (sic)"