Janet Jackson, Adam Lambert, Dr. Oz and Pauley Perrette were among the celebrities tweeting support for World AIDS Day on Thursday.

“On this World AIDS Day, never ever forget our friends who died and fought courageously against their oppressors in their darkest hour,” gay rights activist David Mixner tweeted.

Singer Adam Lambert messaged to his more than 1.2 million followers, “Let's recognize World AIDS Day and RT 'We are going to win this fight,'” a reference to President Barack Obama's speech commemorating the day.

“Love to all that have passed, that struggle & all who support & work for a cure,” Pauley Perrette tweeted.

Dr. Oz said his thoughts were with those affected by the disease. “Together we can achieve a world where this disease no longer exists.”

Many celebrities asked followers to help amfAR, the HIV/AIDS non-profit co-founded by the late Elizabeth Taylor.

“34 million ppl r living w/#AIDS & 7000 infected each day,” messaged Cheyenne Jackson. “Pls help @amfAR find a cure.”

“Today is #WorldAIDSDay,” wrote Janet Jackson. “Go to @amfAR and do whatever you can.”