Photo: April Geary/instagramRobin Thickeand wifeApril Love Gearyare celebrating their little boy.On Sunday, Geary, 28, shared a photo from son Luca Patrick’ssecond birthdaywhich included a red-and-black racecar-themed celebration.“Happy birthday to the best boy in the whole world!!!!” the model mom captioned the family photo, where she holds Luca as Thicke leans in. “The easiest, happiest, cutest boy. Love you Luca boy! ♥️"On Monday, the “Lost Without You” singer, 45 — who is also dad to daughters Lola, 3, and Mia, 4, whom he shares with Geary, and son Julian, 12, with ex-wifePaula Patton— shared a birthday tribute to his youngest onInstagram.Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.“Happy 2nd birthday to the sweetest, cutest boy in the whole wide world! Every day with you is sunshine,” the proud dad wrote alongside adorable images of the toddler. “When you giggle, it makes everything in life make sense. I love you Luca Patrick Thicke!!!“He then added, “Thank you@aprillovegearyI love you! ❤️"The “When You Love Somebody” singer opened up to PEOPLE last year about howbeing a dad “has fed my soul”— particularly since the 2016 death of his own dad,Growing PainsstarAlan Thicke.Fatherhood “brought me back,” he said. “I think probably when I lost my father, it’s no coincidence that I’ve had three children in the last few years … because that’s how big that hole is.““I remember a friend of his and mine said, ‘A big tree has fallen.’ That’s what my dad was. He was the big tree,” he continued.“Now here I am, this medium-size tree, and I’ve got to grow my branches and I’ve got to secure my roots and I’ve got to protect everybody that he was protecting also,” added Thicke. “For me, it’s a job that I’m very happy to do, and every day I try to make him proud of me.”

Photo: April Geary/instagram

Robin Thicke and April Geary

Robin Thickeand wifeApril Love Gearyare celebrating their little boy.On Sunday, Geary, 28, shared a photo from son Luca Patrick’ssecond birthdaywhich included a red-and-black racecar-themed celebration.“Happy birthday to the best boy in the whole world!!!!” the model mom captioned the family photo, where she holds Luca as Thicke leans in. “The easiest, happiest, cutest boy. Love you Luca boy! ♥️"On Monday, the “Lost Without You” singer, 45 — who is also dad to daughters Lola, 3, and Mia, 4, whom he shares with Geary, and son Julian, 12, with ex-wifePaula Patton— shared a birthday tribute to his youngest onInstagram.Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.“Happy 2nd birthday to the sweetest, cutest boy in the whole wide world! Every day with you is sunshine,” the proud dad wrote alongside adorable images of the toddler. “When you giggle, it makes everything in life make sense. I love you Luca Patrick Thicke!!!“He then added, “Thank you@aprillovegearyI love you! ❤️"The “When You Love Somebody” singer opened up to PEOPLE last year about howbeing a dad “has fed my soul”— particularly since the 2016 death of his own dad,Growing PainsstarAlan Thicke.Fatherhood “brought me back,” he said. “I think probably when I lost my father, it’s no coincidence that I’ve had three children in the last few years … because that’s how big that hole is.““I remember a friend of his and mine said, ‘A big tree has fallen.’ That’s what my dad was. He was the big tree,” he continued.“Now here I am, this medium-size tree, and I’ve got to grow my branches and I’ve got to secure my roots and I’ve got to protect everybody that he was protecting also,” added Thicke. “For me, it’s a job that I’m very happy to do, and every day I try to make him proud of me.”

Robin Thickeand wifeApril Love Gearyare celebrating their little boy.

On Sunday, Geary, 28, shared a photo from son Luca Patrick’ssecond birthdaywhich included a red-and-black racecar-themed celebration.

“Happy birthday to the best boy in the whole world!!!!” the model mom captioned the family photo, where she holds Luca as Thicke leans in. “The easiest, happiest, cutest boy. Love you Luca boy! ♥️”

On Monday, the “Lost Without You” singer, 45 — who is also dad to daughters Lola, 3, and Mia, 4, whom he shares with Geary, and son Julian, 12, with ex-wifePaula Patton— shared a birthday tribute to his youngest onInstagram.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

“Happy 2nd birthday to the sweetest, cutest boy in the whole wide world! Every day with you is sunshine,” the proud dad wrote alongside adorable images of the toddler. “When you giggle, it makes everything in life make sense. I love you Luca Patrick Thicke!!!”

He then added, “Thank you@aprillovegearyI love you! ❤️”

The “When You Love Somebody” singer opened up to PEOPLE last year about howbeing a dad “has fed my soul”— particularly since the 2016 death of his own dad,Growing PainsstarAlan Thicke.

Fatherhood “brought me back,” he said. “I think probably when I lost my father, it’s no coincidence that I’ve had three children in the last few years … because that’s how big that hole is.”

“I remember a friend of his and mine said, ‘A big tree has fallen.’ That’s what my dad was. He was the big tree,” he continued.

“Now here I am, this medium-size tree, and I’ve got to grow my branches and I’ve got to secure my roots and I’ve got to protect everybody that he was protecting also,” added Thicke. “For me, it’s a job that I’m very happy to do, and every day I try to make him proud of me.”

source: people.com