The WWE has officially added some new matches and stipulations to Extreme Rules.

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It was confirmed this week on SmackDown that Roman Reigns will battle The Big Show in a Last Man Standing match while Sheamus and Dolph Ziggler will clash in a "Kiss Me Arse" bout.

Reigns and Show have been feuding since before WrestleMania and their rivalry escalated on Monday Night RAW this week from London when Big Show chokeslammed Reigns through a car on the stage at ringside.

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Big Show confirmed on SmackDown in England that the two will battle in a Last Man Standing match via The Authority.

Reigns told Michael Cole this week that he plans to bring the fight to Big Show.

"He better not get tired," Reigns said. "He better have his cardio all right because I'm gonna keep getting up. He's gonna have to continue to knock me down. Pick me up. Slam me. Punch me in my mouth. Drop me on my head. I'm gonna get up and when I do I'm gonna bring a big fight to The Big Show. And you can believe that."

Regarding Sheamus and Ziggler, the feud between them continued to grow after the "Celtic Warrior" viciously attacked "The Showoff." Sheamus revealed the stipulation on SmackDown, and WWE.com revealed a little bit more behind the stipulation, which is similar to when The Rock faced Billy Gunn at SummerSlam 1999.

"There may not be a championship on the line when Dolph Ziggler battles Sheamus at Extreme Rules, but there is something just as valuable at stake: pride," the site wrote. "Because on Sunday, April 26, one Superstar will walk out the victor and one Superstar will be faced with complete and utter embarrassment when the two intense warriors battle in a Kiss Me Arse Match."

The site continued: "A fed-up Ziggler took aim at Sheamus with a scathing speech on SmackDown in London, prompting the mohawked Superstar to challenge the former World Heavyweight Champion to the first Kiss Me Arse Match at Extreme Rules. Traditional singles match rules will apply for the contest, but with a very untraditional stipulation: the loser must kiss the winner's arse. There may not be anything more humiliating for a competitor to do than have to kiss his adversary's backside. And at Extreme Rules, either The Celtic Warrior or The Showoff will be forced to go through with this extremely embarrassing act in front of the entire WWE Universe."

Extreme Rules emanates from the Allstate Arena in Rosemont, Ill. on April 26 and is headlined by a Steel Cage match between WWE World Heavyweight Champion Seth Rollins and Randy Orton.

Elsewhere, John Cena will put his United States Championship on the line against Rusev in a Russian Chain match while Daniel Bryan's Intercontinental Championship will hang in the balance when he takes on Bad News Barrett.

There's no word yet if Bryan being removed from the European tour for health concerns will have any effect on the match.

Paige is also set to battle Nikki Bella for the Divas Championship, but that match may be altered now that the WWE seemingly wrote the two-time Divas Champion off television with Naomi's heel turn.

Here is the full card for WWE Extreme Rules coming out of SmackDown:

WWE World Heavyweight Championship Steel Cage Match
Seth Rollins (c) vs. Randy Orton
***Orton's RKO is banned from use during the match

WWE United States Championship Russian Chain Match
John Cena (c) vs. Rusev w/ Lana

WWE Intercontinental Championship
Daniel Bryan (c) vs. Bad News Barrett

Last Man Standing Match
Roman Reigns vs. The Big Show

"Kiss My Arse" Match
Sheamus vs. Dolph Ziggler

WWE Divas Championship
Nikki Bella (c) w/ Brie Bella vs. Paige