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Kevin Hart escalated his prank war with pal Nick Cannon by plastering "The Masked Singer" host's real phone number on billboards in 3 cities.

The prank war escalated after Nick bought Kevin a live llama for his birthday earlier this month. But the Jumanji star was unimpressed and called the prank "childish."

He shared a message Nick sent him along with the animal, which read:

"Since I'm having all these new kids, I thought I would bless you with a new one as well. Save the drama for your llama. Happy birthday."

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Kevin poked fun at the fact that Nick is now a dad of seven. He paid for billboards that displayed Nick's real mobile phone number in Los Angeles, Atlanta and New York.

The billboards read: "For any advice on fatherhood? Call my best friend Nick Cannon."

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Kevin shared an image of the billboards on Instagram, and wrote:

"Since my brother @nickcannon decided to buy me a lama [sic] for my B Day I decided to do something nice for him as well... Here is a digital billboard in Los Angeles... I also did some in ATL & NY. If u want any advice on fatherhood please call my BEST FRIEND @nickcannon... I'm sure his phone has been ringing nonstop. GOTCHA BACK B**CH #PRANKWARS."

Nick took to his Instagram Story, revealing that his phone "won't stop ringing", and adding that he "hates" Hart for the epic prank.