The pop group previously announced plans to play 14 arena shows across the UK next April, but have now had to extend the string of concerts due to high demand.
The newly announced dates include a second night at London's O2, as well as further shows in Manchester, Birmingham, Glasgow, Sheffield and Newcastle.
Tickets for the added concerts will go on general sale from October 21 at 9am, with a fan pre-sale 24 hours before.
Reports have suggested that the chart act have sold over 100,000 tickets since the first batch were released on Friday (October 14).
Steps topped the UK album chart on the weekend with their compilation LP The Ultimate Collection.
The group recently told Digital Spy that they are considering recording new material for a comeback album.
The added Steps UK tour dates are as follows:
- April 20 - London, O2 Arena
- April 22 - Newcastle, Metro Radio Arena
- April 23 - Glasgow, Braehead Arena
- April 25 - Birmingham, LG Arena
- April 26 - Manchester, MEN Arena
- April 27 - Sheffield, Motorpoint Arena
Watch Digital Spy's exclusive interview with Steps below: