The 29-year-old producer reunited with the emo band in January for the release of a single named 'Make War' after first leaving the group in 2007 to focus his attention on dance music.
However, Skrillex - whose real name is Sonny Moore - appears in a new picture of the band on their official Twitter page, which is captioned: ''2017 Vibes <3 (sic)''
The group's Twitter bio now also includes Skrillex's handle, proving that he has returned to From First to Last.
However, the group's recent reunification has also created some controversy, as From First to Last were accused by punk band Culture Abuse of ripping off their artwork on the 'Make War' cover.
Culture Abuse's 2016 album 'Peach' features an image of a peach, barbed wire and a pink background - and fans were quick to highlight the similarities.
Later, the group from San Francisco shared a post that read: ''From First To Last: 'hey, can I copy your homework?' @cultureabuse: 'sure, just don't make it too obvious' (sic)''
But Skrillex rubbished the allegations in a statement, insisting that the apparent similarities were a ''complete coincidence''.
He also encouraged music fans to ''check out'' Culture Abuse's work.
Skrillex said: ''Just wanted to convey we were unaware of the band Culture Abuse's cover art with a peach similar to ours for From First To Last that we released yesterday. It was a complete coincidence, and we would never disrespect or appropriate another artist's work.
''Shout out to Culture Abuse, and as a positive to come from this, hopefully people will go check out their music and show them some love.''
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