Little Mix star Perrie Edwards has announced she's set to marry her long-term boyfriend Alex Oxlade-Chamberlain as he popped the question while on holiday.The singer, 28, who recently showed off her washboard abs in a bikini, took to her Instagram feed to share the happy news with her 15.2million followers as she posted a series of photos of them standing on the beach with a romantic sunset in the background. In one snap, Alex, also 28, who Perrie shares son Axel with, is down on one knee as Perrie holds her hands to her face.