Tom Welling is to be a father for the second time.

Tom Welling and wife Jessica

Tom Welling and wife Jessica

The 'Smallville' actor initially played it coy when questioned on news his wife Jessica is pregnant with a sibling for their two-year-old son Thomson.

Tom appeared on his former 'Smallville' co-star Michael Rosenbaum's 'Inside of You' podcast and when the host brought up the news he's got a baby on the way, the actor said: "What? I do?"

Michael reassured him he had heard the news from Jessica herself, prompting Tom to call his wife to confirm.

Michael joked: "You lying b******! But you do! You have another one coming!"

While the 43-year-old star was reluctant to share any details about the impending new arrival, he heaped praise on his "hilarious" son.

He told Michael: "He's a good, cute, funny kid. He makes me laugh all the time."

The former 'Lucifer' star and his wife celebrated Thomson's second birthday earlier this month with a "barn party", with Jessica branding the tot a "full moon horse lover".

Sharing details of the celebration on Instagram, she wrote: "Raising Sweet T amongst Mother Nature and her precious gifts instills lessons and meanings to life unspoken. This is my wish for all of Earth’s children – The chance for Mother Nature to be the teacher.”

Tom and Jessica married in December 2019 after five years together.

And last month, the 'Cheaper By the Dozen' actor paid tribute to his wife on their wedding anniversary.

He shared a black and white photo from their big day on Instagram and simply captioned the post: "SO LUCKY (sic)"