Ms Cairns first became a Councillor in 2019
Holly Cairns will be the next leader of the Social Democrats after all the party's other TDs ruled themselves out of any potential leadership contest.
The Cork South-West TD took to Twitter to confirm she would put herself forward and she was "excited" to do so.
Fellow TDs Wicklow's Jennifer Whitmore and Cian O'Callaghan have now ruled themselves out and are backing Ms Cairns.
Dublin Central TD Gary Gannon ruled himself out early last week.
Kildare North TD Catherine Murphy and Róisín Shortall stepped back last week, claiming the time was right to hand the reigns to the next generation.
Ms Cairns will officially take over as leader of the party at noon on Wednesday when nominations close.
She is a first-time TD and became a county councillor in 2019.

Families Could Face €1,000 Rise In Annual Food Bills Amid Farming Crisis
Over Half of Cigarette Packs Surveyed In Newbridge And Naas Had No Irish Duty Paid
Celbridge Brewery CEO Warns Of Mounting Costs Facing Craft Beer Sector
Amhrán na Laoch Songwriting Competition Confirmed for Irish Music Month 2026
Government Announces Major Overhaul of Anti-Money Laundering Rules
Maynooth University Hosts Special Solar Eclipse Event This Evening
Johnstown Mother Says Today's Solar Eclipse Means Something Extra Special For Her And Her Son
Three Men Detained In Kildare And Dublin Garda Stations Following Brothel Keeping And Organised Prostitution Arrests