Huge night on <i>The Voice</i>: Keith Urban and Katy Perry drop by!

It's going to be a star-studded night on The Voice this evening with season one coach Keith Urban and special guest Katy Perry appearing on the hit Nine show. Take a sneak peek in the promo above!

Keith performs his new single 'Shame' and reunites with former colleague Joel Madden.

"I miss Joel," Keith says on his return. "I miss the lollies they would bring around in the big red chair!"

It's also the first time Keith and Kylie Minogue have ever met.

US pop queen Katy drops in on Team Kylie contestants Kat Jade and Hayley Jensen as they tackle her colossal hit 'Roar'.

"It's a tough song to sing. I actually take it down half a key live," Katy reveals.

If last week's battles were anything to go by, we're in for an epic night of edge-of-your-seat performances. The most memorable for us was Louise Van Veenendaal and Jayde Grey's take on Kelly Clarkson's 'Since You've Been Gone'. Watch here:

The Voice airs tonight at 6.30pm on the Nine Network. Catch up on the battle rounds and view exclusive content at thevoice.com.au.

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