SYDNEY, AUSTRALIA - OCTOBER 12: (EUROPE AND AUSTRALASIA OUT) (L-R) Jade Thirlwall, Jesy Nelson, Perrie Edwards and Leigh-Anne
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Little Mix fans rejoiced at the release off the British quartet's new single, "Shout Out to my Ex," but girl group G.R.L. is none too happy.

The official Twitter account for the band tweeted out a subtle, yet quite understood, hashtag after the release of the new Glory Days song.

"Ugly Heart" is the title of G.R.L.'s 2014 hit, which gained attention after the tragic death of member Simone Battle. The band disbanded in 2015 but reunited in August with new member Jazzy Mejia.

Listen to both songs below:

Below, watch Little Mix and Fifth Harmony interview each other in the Fuse studios: