She has been in two celebrity relationships averaging approximately 4.0 years each.
Heidi announced on Friday that Alex proposed Alex, who has been dating the Liverpool-born star for around 18 months, was also thrilled to share the news.
Her former bandmates from the many incarnations of the Sugababes over the years - Keisha Buchanan, Mutya Buena, Siobhán Donaghy, Amelle Berrabah and Jade Ewen - have yet to congratulate her on her big news.
She recently joked that her pet pug was as besotted with Alex as she is, telling Now magazine: 'Bettie's obsessed with him.
She's even matched her lippy and nails - that's worthy of a standing ovation from girl bands the world over in our eyes.
Heidi has however bucked the trend and added a blue bag - a controversial choice given the coordination of the rest of her outfit, but it is Chanel (it's also 2015) so we'll let this one slide.
MTV and Capital London presenter Dave Berry proposed to her during a New Year's Eve holiday in India although on 10 December 2011 Heidi revealed that the couple had separated after eight years together.
Heidi India Range (born May 23, 1983) is a British singer-songwriter and the longest-serving current member of girl group Sugababes which she joined in August 2001.
The corridor lights were only activated when you walked directly past them.
If I'm working away for a long time I also take an old jumper that Dave's worn to remind me of his smell. For a long-haul flight, go out the night before and get as little sleep as possible.
Then get on the plane, have a glass of champagne and fall into a beautiful deep sleep. We hope to visit Japan for the cherry blossom next spring. My holiday to Miami this summer was ruined by the paparazzi.
When The Stage's MAtthew Hemley accepted a cameo in a touring musical he couldn't wait to get started.
But finding a 50s outfit and tackling an American accent proved to be a bit more difficult than he expected...
If you're on a winter holiday, you want snow and cold; if you're on a summer holiday, sun is essential. A pair of socks for the plane so you don't get cold feet when you're wearing sandals.