Former Celebrity Big Brother star Alex popped the question to Nikki this week, after almost two years of dating.
Nikki reportedly broke the news via her Instagram page, showing off her diamond ring in a series of snaps.
And the personal trainer seems to have confirmed her engagement news on Twitter account. Although her profile is private, in her bio Nikki has proudly stated: "Fiancée to @alexreid."
Former cage fighter Alex, who declared in April last year he had found love again with Nikki, is yet to publicly comment via Twitter.
This will be Alex's second marriage. The 39-year-old was married to Katie for less than a year before splitting in January 2011. Alex then dated former CBB star Chantelle Houghton. The pair, who are parents to daughter Dolly, got engaged but split soon after.
Meanwhile, after her split from Alex, former glamour model Katie went on to marry Kieran Hayler in a ceremony in The Bahamas in January 2013.
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More stars who have announced engagements this year:
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