Katy Perry and Kate Hudson
Katy Perry and Kate Hudson Twitter/kittenstruck

Kate Hudson and Katy Perry graced the red carpet for the third annual American Foundation for AIDS Research (amfAR) Inspiration Gala at Milk Studios in Los Angeles.

Hudson wore a red Prabal Gurung Resort 2013 gown with a plunging neckline and a cut-out at the shoulders. She topped it with a gold necklace and a black-and-gold studded clutch. She maintained minimalist looks with shining eyes, glossy lips and a ponytail. Perry turned out in a lace floral gown with a frilly neckline and a white gem-studded waist belt.

The 27-year-old singer also performed at the event and agreed to donate one of her guitars to help raise money for the organisation. She has also promised to sign it with a personal dedication to the winning bidder to increase its value.

"We're thrilled to announce that superstar Katy Perry has donated a guitar to auction off at amfAR's Inspiration Gala Los Angeles tomorrow. Katy will personalise an autograph on the guitar to the lucky winner. All proceeds benefit our research programs... Thank you, Katy!" a spokesperson for the charity posted on Facebook.

The Firework singer had also made headlines as she performed at President Barack Obama's 30 Days to Victory concert fundraiser and tweeted a picture of her "appropriate nails," which were adorned with Obama's face, the Democratic donkey and red, white, and blue stars and stripes.

"I sang for President @BarackObama last night because I believe in Equal Rights#ForAll #Vote," she tweeted.

In addition to Perry and Hudson, other celebrities who joined them at the event included Sarah Jessica Parker, who looked casual in a simple, sleek style black jumpsuit with spaghetti straps. Other A-listers who attended the event included Victoria's Secret model Alessandra Ambrosio, Sex And The City star Kristin Davis, Rumer Wilis, who was accompanied by boyfriend Jayson Blair, Rose McGowan and Octavia Spencer.

The amfAR was founded in 1985 and is dedicated to ending the global AIDS epidemic through innovative research.