The girl group sang a collection of their hits at the Asda Tickled Pink concert at Shepherd's Bush Empire, which was organised to raise money for breast cancer research.
However, White was absent from the set and the remaining members - consisting of Frankie Sandford, Rochelle Wiseman, Una Healy and Mollie King - failed to give a reason.
The Saturdays' Frankie and Una sign autographs for fans ahead of their set at the Tickled Pink concert.
Despite mentioning Healy's pregnancy and Wiseman's recent engagement to JLS star Marvin Humes, the foursome didn't acknowledge White's absence throughout the entire 40-minute show.
It is thought White travelled to the gig earlier in the day, after she tweeted: "Listening to @choicefm on the way to work playing the TUNES!!!"
Sandford was absent from the group before Christmas under doctors' orders, but managed to rejoin them for their recent UK arena tour.
Addressing split rumours at the time, Wiseman told Digital Spy: "No, we're not splitting. She's not very well and you can't even have a flu or a runny nose before people start saying you've left [the group]."
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Watch the music video for The Saturdays' 'All Fired Up' below: