Christina Aguilera was "starstruck" the first time she met Drew Barrymore

Appearing on 'The Drew Barrymore Show', she told the host: "I get really shy, especially the more you respect someone you're like I can't even you know make eye contact.

"I am the weirdest nerd about that kind of thing too. But, I did have the courage to get the nerve to go say hi to you one time.

"I was so green to LA, I was like a teenager and I was so green and starstruck to everything and then there's Drew Barrymore sitting at the next table."

The 43-year-old singer managed to pluck up the courage to approach the 'Charlie's Angels' star, and she still remembers the "warm" exchange so fondly.

She added: "You went to go to the bathroom and I was like, 'This is my moment.'

"And I went and I told you, I was like, 'Hi, I'm Christina and I'm such a big fan and I'm here recording my album for the first time and I just wanted to say hi to you and blah, blah, blah.'

"And you were the kindest celebrity I've ever met. You were so warm and so kind to me and I've never forgotten that about you, so thank you for doing that for me."

Drew is "glad" she left an impression, insisting: "That's how people are supposed to behave."

Christina pointed out that some people may not always be approachable "depending on what day or whatever", but she's glad Drew was so willing to chat.

She said: "But then we all have our walls and we get guarded and I think depending on what day or whatever but it was just so kind of you to be just so warm and you were like, 'Good luck with that.'"