The couple were joined by their two other sons Mason, 7, and Brady, 5, for a day of fun at the adventure resort in Los Angeles.
It may have been all for Tucker, but Melissa looked to be having a whale of a time as she enjoyed the variety of rides on offer in Fantasyland.
The 37-year-old dressed casually in a navy blue vest top and was documenting the ride with her camera - surely she'll have ones to put in the family album!
Tucker looked adorable in a blue T-shirt as he held onto the handle bars of the ride and took in all the surroundings. Meanwhile, Mark kept a tight hold of his son, especially on the water log ride as they all prepared to get soaked!
Melissa also uploaded several photos to Instagram of her family day out. Posting a close-up snap of Tucker, she said: "Birthday boy loving the #JungleCruise at @disneylandtoday."
In another adorable snap of her three boys, she commented: "Spending Tucker's (actual) 1st birthday at the Happiest Place on Earth! #disneyland #disney #birthday #boys #kids."
Former Sabrina The Teenage Witch star Melissa, threw a huge birthday party for Tucker on Saturday (17 September) with his family, friends and kids at her home in Connecticut.
It was fun-filled day with plenty of activities on offer, as older children took part in sack races and bounced around on the trampoline, while the infants lounged around on the grass with toys.
The actress, who is preparing to release her autobiography, Melissa Explains It All next month, told People all about preparing for Tucker's bear picnic theme party.
Speaking about Tucker blowing out his candles, Melissa explained: "Tucker was so confused! He was so mesmerized by everyone looking at him that he didn't know what to do. He just started clapping!
"Once everyone sang to him, Mark and I put his fingers in the cake. He was shy at first, but then figured out what to do and went crazy." Aww, how cute!