The sisters raised eyebrows when they locked lip during the finalists' opening performance on Sunday night, raising accusations of inappropriateness for a family show.
They later laughed off the criticism, saying they were just trying to spread a bit of love in the world.
A tweet from their official account read: "I Love my sister #sorrynotsorry."
Last night, the British pop duo were trying to spread the love again, puckering up while attending the media night performance of Wicked in London.
Blonde Electra - Jazzy King and Ruby King - were eliminated in week one of this year's X Factor, which was won by Ben Haenow at the weekend.
The girls have thanked judges Simon Cowell, Cheryl Fernandez-Versini, Mel B and Louis Walsh for all their help and support throughout the process, which saw them go through auditions, boot camp, judges' houses and then the live shows.
"A BIG thank U to @SimonCowell @OfficialMelB @CherylOfficial and Louis. Thank U for believing in us enough to give us a chance. We (love) U guys!"
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Watch the sisters' performance on Sunday night: