On Thursday – ahead of Andre's surprise proposal – she added to this sentiment, posting a romantic image of the couple on a white sand beach alongside the words "Happy Anniversary baby… how has 4 years gone so fast! All I know is I'm another year more crazy about you. I couldn't love you harder if I tried."
Bandmates Perrie Edwards, Jade Thirlwall and Jesy Nelson — who teamed-up with Leigh-Anne when the band was formed by Simon Cowell on The X-Factor — were among the first to congratulate their musical sister.
“My heart is so happy. I absolutely adore you both! YOU. HAVE. A. FIANCÉ," wrote Perrie. "Congratulations to a dream coming true and @andregray_ getting the most amazing girl in the world!”
Jade, added “I love you so muchhhhhh and am so happy for you bothhhhh. I gotta new brother in law y’all.”
Jesy, also wrote “These pictures. Love you both you deserve the world.”
As for Leigh-Anne's new fiancé: he pushed the romantic level even higher, using Spanish to say they would be together "until death."
"Let the caption speak for itself this time…," he posted. "Hasta la muerte."
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