Christina Aguilera's Tan Mishap and Her Other Unfortunate Moments

Christina Aguilera intended to pay tribute to her idol, Etta James, by performing her classic "At Last" during her memorial service last Saturday. Instead, all anyone wants to talk about is the questionable liquid running down the inside of her legs.

The "Beautiful" singer - clad in a black suit with too much cleavage - belted out the song while the streaks dropped at a noticeable pace. Some thought she was wetting her pants, while others were more R-rated with their assessments.

The real culprit? Self-tanner.

"She sang her heart out. It was a memorial service for her idol and she was nervous," a source told US Weekly. "It was her proudest moment. The sweat caused her spray tan to streak."

Sadly, that was hardly the 31-year-old singer's first embarrassing moment while performing.

2011 Super Bowl

Aguilera is known for her powerful vocals - and that strong voice helped people hear the awful way she butchered the National Anthem during Super Bowl XLV. No, she didn't flub the lyrics - she changed them! She sand "What so proudly we watched at the twilight's last gleaming" instead of "What so proudly we hailed at the twilight's last gleaming."

She has a good attitude about it, though. The judge on "The Voice" talked about her most embarrassing moment in a promo for the hit NBC singing show.

"I've slipped a little, tripped a little but I forgot the lyrics to the National Anthem at the Super Bowl. I take the cake," she joked.

Michael Jackson Tribute Concert

Aguilera used to be really, really thin. Over the years, she's filled out - but she still rocks the skin-tight outfits that she wore as a 100 lb. teen. Take for instance her performance last summer at the Michael Jackson tribute concert in Wales. The singer surprised fans when she took the stage in a too small leotard outfit and disheveled hair.

Not that she cares, though. The divorced singer said she's comfortable in her own skin, as long as her son is happy.

"I've been criticized for being on both sides of the scale," she told Marie Claire in the February 2012 issue. "It's noise I block out automatically. I love my body. My boyfriend loooves my body.

The 2011 Grammys

Aguilera raised questions when she tripped at the 2011 Grammy Awards during a tribute to James Brown. "Insiders" blamed her fall on alcohol, though no one really saw the slip at home.

"She was acting very erratic backstage before her performance and wouldn't let anyone into her dressing room before the show began. Something is very wrong," a source told PopEater at the time.

The verdict? Christina Aguilera is human - and all humans mess up from time to time. But still, it's probably a good idea to apply self tanner the day before an event, Christina.

More from this contributor

50 Cent and Other Celebrities Who Make Big Cash With Bets

Tim Gunn and Other Celibate Celebrities

Nicole Scherzinger and Other Celebrities Who Look Better Without Makeup

Note: This was written by a Yahoo! contributor. Join the Yahoo! Contributor Network here to start publishing your own articles.