Adam Lambert is currently working as a judge on the latest series of The X Factor in Australia, but he has enjoyed an incredibly varied career so far that has seen him tour as the frontman of Queen, star as Eddie in the recent remake of The Rocky Horror Picture Show and return to American Idol as a guest panelist. 

To celebrate his achievements and talent, we have rounded up five quotes from other stars who have publicly expressed their admiration for both his personality and his numerous talents. 

1. Harry Connick Jr. joined American Idol as a full-time judge in 2013 for Season 13 and praised Adam Lambert's ability to both connect and empathise with the contestants when he stepped in to briefly replace Keith Urban:

"He was terrific, and having the perspective of someone who has been a contestant was really unique. It was so unfortunate, the circumstances having Keith not being there, but you couldn’t find a better replacement for him. Those shows were exciting. It was really cool."

2. In 2015 Robbie Williams told the Polly and Grant radio show in New Zealand that he admires the vocal powerhouse's talent and would love to duet with him in the future:

"He’s really handsome and strikes me as a nice person. I should sing something with him. Will you tell him I said, ‘Hi’ and send my love and I said we should do something together?” 

3. Adam Lambert has been touring with iconic rock band Queen for a few years now and members Brian May and Roger Taylor regularly shower praise on his ability and prowess. Legendary guitarist Brian May told The Telegraph that Lambert has an inimitable talent:

"Adam is a phenomenon. We weren’t looking for another singer but Adam is kind of a gift from God. He has a technical ability beyond 99.9 per cent of singers in the world. You see that and can’t help but think, 'I wonder what would happen if we opened that box again?'"

4. Four years ago Meat Loaf revealed to ITV's Daybreak that he thinks Adam Lambert is one of the three greatest vocalists of all time:

"There's only 3 singers that I've ever thought in life that have this ability to do what is called an 'overdrive'. One is Aretha (Franklin), one is Whitney (Houston) and there's a singer named Adam Lambert - a young kid - that has this overdrive, and I'm really jealous of those people."

5. Adam Lambert recently starred in the TV remake of The Rocky Horror Picture Show and his costars have had nothing but praise for his involvement in the ambitious project. Victoria Justice, who played Janet in the remake, told BUILD Series that it was amazing to see him in action on set:

"Every take he brought something new - he had so much energy. He was, like, wrapping the microphone cord around him and sticking his tongue out - he was so into it. It was just amazing to watch such an incredible performer."

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Watch Adam Lambert in action here: