Usher Celebrates Son Sire's Third Birthday with a Cars-Themed Party — See All the Adorable Photos!

Usher is celebrating his youngest son on his big day.

On Monday, Sept. 20, the "OMG" singer, 45, shared a series of adorable snaps and videos to Instagram, as he celebrated his and his wife Jenn Goicoechea's son Sire on his third birthday. At his Cars-themed party, the father-son duo can be playing with a Lightning McQueen toy car while enjoying chocolate cake and cracking up.

"Celebrating Sire!! Happy birthday to U!," the proud dad of four captioned the post.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories.

Another snap shows Usher wearing a birthday hat and clapping alongside his little one, who's standing above his large birthday cake with a bunch of Cars balloons behind him.

The post also included a video, where dad Usher can be seen in ultimate dad mode. He picks up the cake and yells, 'Who wants cake?' The 3-year-old party guests all cheer, "Me!" and Sire excitedly points at his dad.

The musician and Goicoechea are also parents to daughter Sovereign Bo, 3, as well as sons Usher "Cinco" V, 16, and Naviyd Ely, 15, whom he shares with his ex-wife Tameka Foster.

The PEOPLE Puzzler crossword is here! How quickly can you solve it? Play now!

The Grammy-winning artist was recently interviewed for The Cut's first-ever solo print issue, where he opened up about his relationship with his four kids.

The musician noted that although he tries to keep his kids away from some of the hardships of life, he realizes that he can't. Instead, he tries to lean into those emotional moments, connecting with his kids through music.

"I try to coddle my kids to protect them from emotions and life and love and sex – you can't!" Usher told the outlet. "They want to experience things too. Why make them feel as though they need to hide it?"

"One of the greatest gifts I could ever give to one of my children is to be able to tell them, 'I know exactly how you feel right now. Listen to this song,' " he continued. "My house is like a mini art gallery, and my kids are the features."