Lady Gaga, Tegan and Sara, Tim McGraw Share Pre-Oscar Tweets and Pictures Ahead of Performances

Although the Grammys already occurred earlier this month, some big music names will be at tonight's (Feb. 22) 87th Academy Awards. Lady Gaga is slated to perform at the Oscars, but no details have been revealed about her involvement. Tim McGraw will pay tribute to Glen Campbell by performing the legendary singer's final career single, "I'm Not Gonna Miss You." Tegan and Sara will link up with The Lonely Island for a live rendition of The Lego Movie's "Everything is Awesome."

The performers took to social media today to express their excitement ahead of the ceremony. Most of the artists posted pictures from the rehearsals as well, Billboard notes.

"Slept 8 hours last night. Woke up refreshed and relaxed. No bags under my eyes. Not an ounce of anxiety in my body. Just kidding. #Oscars," Tegan and Sara tweeted. The sister duo sang "Everything is Awesome" with The Lonely Island for The Lego Movie, one of 2014's suprise hits.

"It's a crazy earworm," Sara told The Hollywood Reporter about the song. "As someone who prides myself on being able to write things that are memorable and hooky, the second that we heard this song, I was astounded. Whether you like the song or not, whether you think it's funny or annoying, there's no denying that it's a ridiculously hooky thing."

Gaga's involvement in the ceremony was announced earlier this month. Mother Monster, who has been on a serious jazz streak since collaborating with Tony Bennett on Cheek to Cheek, may have the honor of singing during the In Memoriam section of the broadcast.

Campbell's "I'm Not Gonna Miss You" was written for the documentary Glen Campbell...I'll Be Me. The doc highlights the singer's final concert and battle with Alzheimer's disease. Campbell is currently in a treatment facility, which is why McGraw will take his place.

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Tim McGraw, Glen Campbell, Tegan and sara, The Lonely Island, Lady Gaga, The Academy Awards