Keisha Buchanan, Mutya Buena and Siobhan Donaghy of MKS were spotted on the front row at the Sister by Sibling show at London Fashion Week.
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PM spokesman's comments come following reports that the EU is secretly drawing up plans for greater military cooperation across the EU.
The Labour politicians put their alleged differences aside to jointly highlight how remaining in the EU could help fight climate change.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.