The singer, 27, wed his sweetheart of six years on Saturday (3 May) surrounded by friends and family - including his JLS bandmates and their partners.
The couple tied the knot at Mount Stuart country house on the Isle of Bute, and JB - real name Jonathan Benjamin - later took to Twitter to gush about the happy event.
In a message after the ceremony, he wrote: "Thank you all so much for your amazing messages of congratulations. Can honestly say that was the #Bestdayofmylife xx."
JB, who turned his hand to farming after JLS split in 2013, later returned to social media to share some more happy news - that he had become an uncle to his younger brother's newborn baby son, who was welcomed into the world on the same day.
He tweeted: "#happiestmanontheplanet...I became a husband yesterday to the most beautiful wife @chloetangney and an uncle to a gorgeous nephew!!x"
Chloe - who promptly changed her Twitter name to Chloe Gill - said: "I married the man of my dreams yesterday! Had the best day of my life!! I can now officially say I am Mrs Chloe Gill."
Friends present at the wedding also congratulated the couple publicly.
JLS bandmate Oritse said: "Well done @JBGill & @ChloeTangney. You both looked beautifully happy last night!! I can still hear the sound of bagpipes in my ears lol."
Meanwhile, Aston Merrygold described the day as "amazing", adding: "Hopefully a life filled with even more happiness and joy! Always love x."
Marvin wrote: "Huge congrats 2my bro @JBGill & his beautiful wife @ChloeTangney an amazing wedding day,so proud (Chloe u have 2change ur twitter name now)x"
And his wife Rochelle added: "What a beautiful day yesterday was. Such a blessing to see people so close to us getting married."
Marvin was the first member of JLS to get married, when he wed The Saturdays' star Rochelle last year.
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