Kevin Hart posted Nick Cannon's phone number on billboards offering parenting advice.

The 42-year-old Jumanji actor raised the stakes on his ongoing prank war with Cannon, 40, by posting his real number on huge digital billboards in Los Angeles, Atlanta and New York after The Masked Singer host bought him a llama for his birthday.

Hart shared a picture of the billboard and wrote: "Since my brother @nickcannon decided to buy me a lama 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**** #PRANKWARS (sic)."

The billboard features a picture of Hart and his llama, along with a message saying: "For any advice on fatherhood? Call my best friend Nick Cannon. Hey guys here is his cell #."

Cannon then posted some videos on his Instagram, showing him receiving calls from strangers.

He wrote: "My phone won't stop ringing. Kevin Hart is an a******. I hate @kevinhart4real (sic)."

nick cannon responds to kevin hart s prank ig story data
Keep on calling: Nick Cannon's phone has been ringing off the hook since buddy Kevin Hart blasted his contact on billboards in Los Angeles, New York and Atlanta. Reacting to the prank, Dwayne Johnson commented on Hart's Instagram, "Oh this is good."  

For Hart's birthday earlier this month, Cannon — who has seven children with four different women, with four of the children being born in the past six months — bought him a llama and sent a teasing message.

He wrote: "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."

Hart shared a picture of himself and the llama on Instagram and wrote: "@nickcannon has to be one of the biggest a******* on the planet ....this jack*** sent a Lama to my house for my B Love u man. My brother for life (sic)." — BANG SHOWBIZ

Photo: TPG News/Click Photos