The 35-year-old, who originally left the group in 1998, told GMTV the track was a "big love song" called Headlines.
"It's a Spice Girl classic. We are so proud of it," she said. "We started putting words down before we even had the finalised 'yes' from everyone."
The group are going on a world tour, releasing their album in the UK on 12 November and the single a week later.
'Second chance'
Halliwell said it was hard to "juggle that balance" between work and friendship.
"It's fantastic hanging with girls you really like but there are pressures of work to go with it so it's about finding that balance," she said.
"It's so amazing. It is like waking up and you get a second chance to be something that is so enjoyable," she added.
The group's worldwide comeback tour, which starts in Canada on 2 December, will be the first time Halliwell has performed with the group since she walked out.
Fans will be given a second chance to get their hands on tickets for the London leg on Saturday, when tickets go on sale for two new dates.
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