Halliwell has been with Horner since 2014, well after her days as part of the pop scene ended in 2001, but did go on tour again throughout 2007 and 2008.
Now Mel B has shared her support for Halliwell on Good Morning Britain, as she battles through the difficult period.
“When you are going through something like that you really do need your friends and family and we are all supporting her,” she said. “I feel really sad for Geri.”
She now gets the opportunity to spend some time with Horner ahead of the Australian Grand Prix, with a two-week gap between Formula 1 races affording workers the opportunity to wind down with their families.
Horner’s Red Bull team have the chance to make more history and take their third consecutive 1-2 finish to open the season in Melbourne with a good performance.