Bill, Giuliana and Duke Rancic Credit: Jason LaVeris/FilmMagic; inset:

Bathtime for baby Rancic!

Proud new dad Bill Rancic shared a super cute photo of his son Edward Duke on Sunday.

"Bathtime is finally over . . . take a look at who's ready for some football!" the 41-year-old reality star and entrepreneur tweeted. In the photo, baby Edward, 1 month, looks like he's smiling at the camera after dad wrapped him up in a little white towel with red trim.

Bill and his wife of five years, Giuliana Rancic, welcomed their first child via gestational surrogate on Aug. 29. Giuliana, 37, struggled to conceive for several years and endured several failed IVF attempts, a miscarriage and a breast cancer battle.

"First month with baby Duke and Bill Rancic has been such a blessing," the new mom tweeted on Sept. 28.

"We just stare at him all the time," Giuliana told TODAY on Sept. 19. "He's got big eyes and he'll just stare at you for ten minutes at a time. It's just unbelievable."