Glee Sneak Peek: Look Who's Back For Will And Emma's Wedding Day - Plus, It's Diva Time!

GLEE: Emma (Jayma Mays) prepares for her wedding day in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Artie (Kevin McHale, R) dances with Emma's niece Betty (guest star Ali Stroker, L) in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Jake (Jacob Artist, L) and Ryder (Blake Jenner, C) perform for Marley (Melissa Benoist, R) in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Jake (Jacob Artist, L) gives Marley (Melissa Benoist, R) a Valentine's gift in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Blaine (Darren Criss, L) and Kurt (Chris Colfer, R) perform at Will and Emma's wedding in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Jake (Jacob Artist, L) and Ryder (Blake Jenner, R) chat in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Santana (Naya Rivera, R) and Quinn (Dianna Agron, L) reunite in Lima for Will and Emma's wedding in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Kurt (Chris Colfer, L) and Tina (Jenna Ushkowitz, R) chat at Will and Emma's wedding in the "I Do" episode of GLEE airing Thursday, Feb. 14 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Sue (Jane Lynch) offers her advice in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Eddy Chen/FOX

GLEE: Finn (Cory Monteith, L) and Emma (Jayma Mays, R) challenge the glee club to find their inner powerhouses for "Diva Week" in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Eddy Chen/FOX

GLEE: Brittany (Heather Morris) watches a performance in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Eddy Chen/FOX

GLEE: The glee club is challenged to find their inner powerhouse for "Diva Week" in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. Pictured L-R: Jenna Ushkowitz, Becca Tobin, Blake Jenner, Melissa Benoist, Jacob Artist and Kevin McHale. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: The glee club members show their inner powerhouses for "Diva Week" in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. Pictured L-R: Becca Tobin, Heather Morris, Jenna Ushkowitz, Darren Criss, Alex Newell and Melissa Benoist. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Tina (Jenna Ushkowitz) performs in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Unique (Alex Newell) dresses up for "Diva Week" in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Kitty (Becca Tobin) dresses up for "Diva Week" in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Brittany (Heather Morris) dresses up for "Diva Week" in the "Diva" episode of GLEE airing Thursday, Feb. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX