Iggy Azalea approves Jimmy Fallon's Fancy cover

Jimmy Fallon's cover of Fancy is a hit with Iggy Azalea. Photo / AP

Iggy Azalea has given the social media tick of approval to Jimmy Fallon's cover of Fancy alongside Crosby, Stills and Nash.

Earlier this week, Fallon recruited the rock group for an acoustic treatment of the Australian rapper's hit song.

Reprising his masterful Neil Young impression for the performance, Fallon sang the rap lyrics such as "trash the hotel, let's get drunk at the minibar" with a convincing folk drawl.

Hair extensions and harmonica stylings rounded out the impression.

And it seemed Azalea liked the cover.

She retweeted two links to the hilarious clip, as well as posting it on her Instagram account.

"This made my whole day," she wrote. "So amazing - I am not worthy!"

Azalea hinted the comedic cover was a welcome change from some less favourable coverage.

"Every time I'm on Twitter it's some bulls***," she tweeted. "Well, besides this whole Jimmy thing which made my day."

Fancy is still sitting at No 1 on the US Billboard Hot 100 charts.

- AAP