Despite the controversial relationship of Gwen Stefani and Blake Shelton, the two are getting more intimate with each other and it appears that Shelton is already close with Stefani's kids with ex-husband Gavin Rossdale, as they celebrated son Apollo's second birthday.

The youngest son of Stefani, who will turn two on February 28, had an early birthday celebration, with a cowboy theme at the star's Beverly Hills, California home. The fun party included pony rides, a trampoline, petting zoo, and a live band, adding to the happy mood of the celebration.

Shelton was present in the birthday bash while the child's father was not seen in the event.

Reports reveal that Stefani and Shelton showed their affection with each other during the party.

"[They had their] arms around one another, and [gave each other] little kisses on the cheek," the eyewitness said, according to ET Online. "Blake was very hands-on with the kids, playing and walking around with them."

The couple was close during the party and were even spotted sitting off the side to cuddle. The Voice judges were also seen giggling, whispering and kissing, Hollywood Life reported.

The "Hollaback Girl" singer was stylish as ever during the party donning a patterned dress in red and white worn over a black tank top and coupled it with leather cowboy boots. She wore her platinum blonde hair up in a high ponytail, accessorized it with a red bow, Mail Online reported.

Meanwhile, the "God Gave Me You" singer was wearing his signature casual look with a multicolored baseball cap, a plaid button down, and dark wash jeans.

Other celebrities who were present at the party that lasted for four hours are Jessica Alba, Rachel Zoe and James Corden.

The pair revealed their relationship publicly in November last year, just a month after Shelton and ex Miranda Lambert announced their divorce and three months after Stefani filed for divorce with husband for 13 years, Rossdale.

 Sunday strolling and snacking #brotherlylove #happiness #familytime XoRZ

A photo posted by Rachel Zoe (@rachelzoe) on Feb 21, 2016 at 7:41pm PST

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