Brie Bella/Instagram; Inset: Randy Shropshire/USA Network/NBCU Photo Bank/NBCUniversal via Getty
In the sweet shot, the little boys, both 9 months, are sitting side by side while playing with a toy set. Matteo and Buddy, pictured left and right, respectively, look as if they are mid-conversation and about to grab each other's hands.
"❤️ BFF's for Life ❤️," Brie, 37, captioned the picture.
Many of Brie's friends raved about the heartwarming photo in the comments of the post.
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"This picture is priceless," one user wrote, while another added, "So sweet❤️"
Pro wrestler Dana Brooke replied, "Omg this photo is life ❤️❤️❤️"
"Wow 😍," WWE star Sasha Banks wrote.
Nikki, 37, welcomed her first child, son Matteo, with fiancé Artem Chigvintsev, on July 31, less than 24 hours before Brie welcomed her second child, son Buddy Dessert, with husband Daniel Bryan, on Aug. 1.
Brie and Bryan are also parents to 3-year-old daughter Birdie.
In August, the Bellas opened up to PEOPLE about their new additions, sharing the love they have for their expanding families. "I've been up since 3 a.m., but this is what I've wanted my whole life," Nikki said at the time. "The fact that he's here — I'm just so in love and happy."
"That's what happens when you're on an infant schedule," added Brie. "But like Nikki said, the love is just so overpowering that even though you're so tired, that bliss just takes over."
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After giving birth, the sisters were placed into hospital rooms right next to each other, and they got to meet their new nephews for the first time.
"What's crazy about Buddy and Matteo is they both have the same scream-cry," Nikki said. "It's the cutest high-pitch noise and they're identical. Even their coos are identical and they're so cute. Now, Matteo, he will grunt and like punch my boobs when he's breastfeeding. Artem and I will sit and laugh because it's perfect little punches he'll do. He grunts at me, so I feel like I have a little boxer on my hands."
"Buddy loves kicking," Brie said. "I actually was really nervous, because everyone's like, 'If you have a good baby, you're going to have a really bad one.' I was like, 'Well, Birdie was so good, so here comes my wild one.' He's calmer than what Birdie was."
"[Both babies] are calm and patient," Brie added. "We're the wild ones and very feisty. Our little boys don't have our personalities yet. Birdie does. Birdie is our mini."