Missy Keating, the eldest daughter of Ronan Keating and Yvonne Connolly, declared: "I'm so happy to be a part of this show and ready to give it my all."
She said that it's "definitely a challenge", but added: "What I'm really most excited about is the glitz and the glam - I've seen some of the costumes and they are just insane."
The 20-year-old model and influencer has starred in two movies, Dark Touch where she played the lead role, and Irish indie film The Sea and in 2019 she auditioned for The Voice UK with her friend Georgia.
A social media addict, she boasts 38,000 Instagram followers and almost 12,000 on TikTok.
Erica Cody was one of the most prominent voices in Ireland amid the Black Lives Matter protests last year.
Her father Gerald Kennedy is an African-American former professional basketball player from North Carolina.
Speaking about taking part on the show, the 25-year-old said she has been pushed out of her comfort zone and is learning new skills.
"I'm so excited to be part of Dancing with the Stars, it's truly a once-in-a-lifetime opportunity to learn amazing skills like Latin and Ballroom dancing," she said.
"Being in the music industry, it's a constantly evolving and fast-moving pace, so to be given the opportunity to do something brand new and to learn and grow within the dance world... I'm just taking it all in."
"It's hard work but tons of fun. I'm so excited to be a part of it and see where it takes me."
She was also named one of Irish Country Magazine's Women to Watch in 2020, and was also part of the Irish collective of female singers and musicians, Irish Women in Harmony, who recorded a version of Dreams by The Cranberries.
Proceeds went to a charity which deals with domestic abuse, which rose significantly during the Covid-19 lockdown.
Meanwhile, retired pro-cyclist Nicolas Roche will be swapping cycling for the cha-cha as he competes in the dancing competition.
Nicolas finished in the top ten of the Vuelta a España on two occasions, and won stages in 2013 and 2015.
He represented Ireland for the first time at the 2008 Summer Olympics in the road race and made three more appearances at the three Olympics that followed.
"I'm very excited to take part in Dancing with the Stars. It's a massive challenge for me, and something completely new. It scares me and thrills me at the same time," he said.
The three famous faces have joined Gráinne Seoige, Aengus Mac Grianna, Ellen Keane, and Neil Delamere who were the first contestants revealed to be taking part on the show.