Tomorrow night, Glee will dedicate an entire episode to Madonna. We absolutely can't wait, especially after hearing from the Material Girl herself about it.

But while we'll cover that installment in-depth right after it airs - updating our Glee music and quotes section accordingly; and penning a detailed recap/review - let's look even further ahead for a few moments.

Later this season, the Fox hit will focus on another iconic singer for a full hour: the cast will go all out for a series of Lady Gaga interpretations. Said creator Ryan Murphy about one upcoming number:

"Lea and Idina Menzel will do an acoustic version of Poker Face... It's sort of like a stripped-down mother-daughter Poker Face that Lady Gaga was involved in."

Yes, he said "mother-daughter." As fans wonder if Murphy just gave away a major spoiler, we also encourage you to check out the photos below. They're behind-the-scenes shots of Chris Colfer and Jenna Ushkowitz getting their Gaga costumes on...

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.