Scott Disick went all out to celebrate his son Mason's 15th birthday for the books.

The proud dad gave the teenager a miniature replica of the iconic Mercedes G-Wagon to mark his special day.

Scott Disick was proud when Mason graduated from high school earlier this year, and shared a touching tribute, calling his young son his "best friend."

Scott Disick spared no expense to ensure his son, Mason, had an unforgettable birthday celebration. On Saturday, December 14, he took to his Instagram account to celebrate his 15th birthday and his son Reign Aston's 10th birthday.

Posting snaps to his IG Stories, the "Keeping up with the Kardashians" alum shared that he gifted his "big boy" son with a mini Mercedes G-Wagon.

"Happy birthday big boy! I felt like it was only fair 4 you 2 get your first g wagon even if it's a mini g wagon it's still a wagon! I love you son!!!!!!," Disick wrote in to his inscription next to one person. photo of a mini black G-Wagon with matching stripe on top.

In another snap, the sweet ride is seen sitting next to other black cars at Disick's estate.

"It has to be the coolest little station wagon I've ever seen! You deserve every inch of it! I love you more than anything in my life," he added, per People Magazine.

Disick didn't miss an opportunity to celebrate his second son, Reign, as he shared a photo of himself attending a Los Angeles Chargers game with Reign and one of his friends.

"I had a good time with you at your first game you asked me to take you to and I don't even like sports," he wrote in the caption. "That's when you know you really love your child! Just kidding I love you more than life young blood, happy birthday son!"

Mason and Reign's mom, Kourtney Kardashian, also shared a touching tribute to both when she posted snaps of Mason carrying Reign on her back, as well as photos from their childhood years.

"My birthday boys. So special to me it hurts my heart," she wrote in the caption.

Grandma Kris Jenner also made sure to celebrate her grandchildren's birthday by posting a lengthy tribute on her IG page.

"Happy birthday to my two amazing grandsons, Mason and Reign! To our birthday twins! I still can't believe you two share the same birthday," she wrote. "What a special blessing that binds you together forever. You are both so deeply loved, and I am beyond grateful to God for choosing me to be your grandmother."

In August, Disick seemingly underwent renovations at his home, as reports suggested Mason moved out of Kourtney's house and moved in with him.

Taking to his Instagram at the time, the 41-year-old reality TV star showed off the results of his bathroom makeover and also added a new rooftop cinema.

He was proud of what he had achieved as he boasted that he completed the renovation work "in a week".

However, the source said Life and style magazine that Kourtney was "heartbroken" that Mason left her house and moved in with his father, seemingly because of Disick's parenting style.

"She's devastated about it. While Kourtney is giving Mason space to work through his feelings, at the end of the day, she blames Scott," the insider said. "The kids can have all the sugar and junk food they want (at his house), and they can stay up as long as they want and watch whatever they want. (He) buys them whatever they want."

"It's no surprise that everyone loves going to his house," the source added. "They love their dad, but it helps that it's a free-for-all when they're there!"

Meanwhile, Mason is said to be doing what he can to mend the strained relationship between his estranged parents.

According to InTouch Weeklysources say the high school senior is "trying hard" to heal the bad blood between Disick and Kourtney after they broke up more than 10 years ago.

"Mason is still living with Scott, but he's been spending a lot of time with Kourtney again and he's really trying to get her to let Scott back into her life more," a source told the outlet.

"The big issue between Kourtney and Scott is Travis (Barker)," the source added. "It's no secret that they don't get along, so that affects the family dynamic a lot."

In April, insiders said Daily Mail that Kourtney stepped in after Scott's significant weight loss had her worried that their three children might lose their father.

It was caused by fans' reactions on social media last month to his shockingly thin face and figure.

An insider said: "Kourtney knows the importance of a father in your life - and she also knows what it's like to lose a father, and Scott does too. Kourtney was worried about him - she knows when it comes to their children. She wants Scott to see what is as healthy as possible Her children need a father.

They further shared that the reality star decided to send "some tough love to Scott to help him get better."

They also said that if Scott didn't agree to get help, Kourtney would "go full force" on him. The insider added: "But Kourtney has her own life, so she's mostly been going through others to get his attention."