Gwen Stefani and Gavin Rossdale Celebrate Their Son Apollo's 7th Birthday with Adorable Selfies

Gwen Stefani/Instagram Gwen Stefani and son Apollo

Gwen Stefani and ex-husband Gavin Rossdale shared a pair of loving tributes on Sunday in honor of their son Apollo Bowie Flynn's 7th birthday.

"Happy b day bday boy!!! #apollo ❤️🎂🎉🎁" Stefani, 51, wrote alongside a cute mother-son selfie.

Over on his own Instagram page, the Bush frontman, 55, shared several throwback snaps with their youngest child, ending on a sweet selfie.

Stefani and Rossale also share sons Zuma Nesta Rock, 12, and Kingston James McGregor, 14. Additionally, Rossdale is also a father to 32-year-old daughter, Daisy Lowe.

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Gavin Rossdale/Instagram Gavin Rossdale and son Apollo

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Stefani's fiancé, Blake Shelton, also plays an important role in her sons' lives.

Earlier this month, the country star, 44, opened up about his relationship with the boys, saying that while being a stepparent isn't easy, he couldn't imagine his life without them.

"I have a stepfather in my life who's one of my heroes. I love my stepfather and I look up to him and he's like a father to me, so I have a good inspiration in my life for how to do this and the kind of stepdad I want to be. And I take it very serious," he said during an interview with KFROG's The Ride with Kimo & Heather.

"But I also have a blast with it" he added. "I don't take it so serious that I'm not enjoying this time because I really am, especially now that we're five years into this thing."

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Over the summer, Shelton opened up about the balance of being both a friend and a role model to the boys.

"It's one thing for me to be with the kids all the time and be their buddy, but you do have to consider after a while that they start to listen to things that you say," Shelton said during a July appearance on Today. "There's a lot of responsibility that comes with that."

Stefani made sure to show her appreciation for Shelton last year, sharing a sweet Father's Day post filled with images of the singer spending time with her three boys. "Thank u for helping me raise these boys!! #weloveyou! Stefani captioned the post.