Christina Aguilera Nearly Falls at Grammys (VIDEO)

Christina Aguilera nearly took a spill after singing a tribute to Aretha Franklin at the Grammys Sunday night. (It was her first performance since flubbing the lyrics to the National Anthem during the Super Bowl.)

As she bowed, she almost fell off stage but luckily grabbed on to a microphone stand, a YouTube video shows.

Twitter also quickly lit up with criticism of her mumbling the words to "Natural Woman."

"I wish I could understand what Christina Aguilera was saying but it sounds WAHAHAHAHAHAHAHAHAAH BABY WAHAHAHAHAHA OOHHHHH WAHAHAHAHA :l" wrote @Ree_Chelle

Joked another, "Christina Aguilera: Like a natural wo... Like a natural wo... Like a natural wooo. #Grammys

Added, stellaresque, "this tribute would be so much better with christina aguilera. ugh. growling and riffs are NOT singing! #grammys

Said dazgale, "Fresh from ruining the national anthem Christina Aguilera is now attempting to ruin the hits of Aretha Franklin."

Some made jokes about her National Anthem mixup.

"SPOILER - Christina Aguilera wins Grammy for "Best Remix of National Anthem" #grammys" quipped  @fauxjohnmadden.

Not everyone had mean words for Aguilera, who was joined on stage by Jennifer Hudson, Martina McBride, Florence and the Machine's Florence Welch and Yolanda Adams.

Wrote Jenni King, "christina aguilera might have messed up the national anthem but that girl can sing!!!!"

Franklin appeared from her Detroit home at the end of the performance, and said, "I cannot tell you how thrilled I am to be with you this evening… I wish I could have been with you all tonight, but since I couldn't, next year, OK?"

She has been reportedly battling pancreatic cancer.