Jennifer Aniston might claim to be "sick" of people poking their noses into her private life but she couldn't resist gushing about on/off boyfriend John Mayer in a new interview.

The Friends star seems completely smitten with the singer, with whom she reunited last month.

She told the Mirror, "He's a rare one. He is extraordinary and it is wonderful to watch him...the way his brain works and the way he thinks thoughts...it's beautiful."

Jen also praised her beau's music: "I don't know many musicians but when his guitar is on him it's just like a channel.

"It's something I've never ever seen before."

See Johnnifer in pictures below