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Trying to brush off her shaky recent past, Christina Aguilera was helping to boost interest in her new gig by attending NBC's press conference for "The Voice" in Los Angeles, California.

With the event taking place at the L.A. Center Studios on Tuesday (March 15), the "Burlesque" star brightened things up in a colorful red frock as she joined up with Blake Shelton, Adam Levine, Cee Lo Green and host Carson Daly.

With Aguilera taking on the duties of a singing coach, she told press of the gig, “There is no good and bad. This isn’t about tearing people down. I want to bring these people up. The Voice really does stand for what it says."

Christina added, “You can judge people based on the way they look. I love that fact we get to sit here with our backs turned away from these people and completely use just one sense to hear these voices. I’m not looking for vocal acrobatics, who has biggest range high and low. I’m looking forward to getting moved."

Continuing to spend time in the Land Down Under, Ke$ha was spotted passing through the arrivals terminal in Sydney, Australia on Thursday (March 10).

Doing her best to avoid having her picture taken, the "Blow" singer's security staffer dutifully tried to keep her covered up by holding a bag over her face as the pair shuffled out to an awaiting car.

The visit to Sydney comes after Ke$ha made a surprise appearance in the audience at Rihanna's Melbourne concert earlier in the week.

Sources tell that the 24-year-old was getting hot 'n heavy while accompanied by British singer and DJ Calvin Harris, with a Herald Sun insider telling, "They were getting right into it. They were practically fornicating."

Asked by paparazzi about the smooch session at the Sydney Int'l Airport, Ke$ha unsurprisingly brushed off the questions by refusing to offer any response at all.

Adding a little more flavor to an already action-packed lineup, Katy Perry has been announced as a performer at the 2011 Grammy Awards.

According to ET, the "Firework" singer will be taking the stage at the Staples Center along with being nominated for four trophies including Best Female Pop Vocal Performance and Album of the Year.

Meanwhile, Eminem topped the nominations with 10 while Bruno Mars earned seven. Other top hopefuls include Jay-Z, Lady Antebellum, and Lady Gaga with six noms each.

Neil Portnow, President/CEO of The Recording Academy, said, "This year's nominations are a true reflection of an exceptional and talented community of music makers that embody some of the highest levels of excellence and artistry in their respective fields. It is most gratifying to see the GRAMMY Awards process once again produce a broad cross section of diverse and impressive nominees across multiple genres. Coupled with the third year of our primetime nominations special, the road to Music's Biggest Night, the 53rd Annual GRAMMY Awards in February, is off to an exciting start."

The Grammy Awards will air on February 13 at 8PM ET/PT on CBS.