[EDITED] The girls play the O2 Arena for the Transformation Trust
Like many girl groups, bandmembers give themselves a sense of unity wearing co-ordinated costumes. But as her Saturdays bandmates opted for matching white ribbed vests on stage at the O2 Arena in London last night, Frankie Sandford decided to upstage them with a skimpy crop top. Clearly proud of her washboard stomach, the 21-year-old flaunted…