WATCH: 5 SECONDS OF SUMMER PERFORM GOOD GIRLS ON TONIGHT SHOW (3 VIDEOS)

Luke Hemmings, Michael Clifford, Calum Hood and Ashton Irwin graced The Tonight Show. They were all over show. The boys of 5 Seconds of Summer helped the host, Jimmy Fallon, sing his favorite tweets with the hashtag #FallSongs.

5 Seconds of Summer also perform the song "Good Girls." The song is from their self-titled debut album.

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5 Seconds Of Summer perform "Good Girls"

In honor of fall arriving, Jimmy gets help from 5 Seconds of Summer to sing his favorite tweets with the hashtag #FallSongs

The boys of 5SOS also did a backstage interview where they revealed the first album they bought.  

Luke Hemmings -- Good Charlotte's The Young & the Hopeless from 2002. 

Michael Clifford -- Eminem’s Curtain Call from 2005.

Calum Hood -- Blink 182’s "I Miss You" single from 2003.

Ashton Irwin -- Green Day’s International Superhits! from 2001.