Former Saved By The Bell star Mario took three-year-old Gia to a special screening of The Wizard Of Oz in IMAX 3D in Los Angeles on Sunday (15 September).
Mario, who hosts US entertainment show Extra, tweeted: "Great daddy/daughter date with Gia... #daddysgirl."
Little Gia dressed for the occasion in her own Dorothy outfit, complete with ruby red slippers and her own fluffy Toto, who sat in her basket.
Proud dad Mario looked as handsome as always in his casual jeans and T-shirt combo, although some fans did seem disappointed that he didn't get into the dressing up spirit too!
Mario retweeted one follower who suggested he'd have made a good scarecrow, lion or tinman, replying: "I regret it now."
The 39-year-old became a father for the second time last week when wife Courtney gave birth to their son Dominic Lopez.
Mario got the news that Courtney was in labour while filming his hosting role on X Factor USA, but luckily managed to get to the hospital in time.
And it seems little Dominic has been a dream baby so far, as Mario said last night: "My son has been awake a total of 20 minutes since he's been born... #DominicLopez #BigSleeper #GoodBaby."