The Bachelor and The Bachelorette favorites are going to be testing their knowledge on Who Wants to Be a Millionaire next month.

Who Wants to Be a Millionaire will air the show's popular "Bachelor Fan Favorites Week" during the first five days of February.

Hosted by Chris Harrison, Millionaire will welcome some of the most popular stars from The Bachelor franchise to play the game for charities close to their hearts.

The week will kick off February 1 with race-car driver and Season 8 The Bachelorette runner-up Arie Luyendyk Jr., who lost Emily Maynard's heart to Jef Holm. He'll be trying to raise money for Children's Miracle Network at Phoenix Children's Hospital.

Next up will be the winner of The Bachelor's sixteenth season, Courtney Robertson, who was previously engaged to Ben Flajnik and penned a tell-all memoir after their public split. She'll be playing Millionaire to benefit Big Brothers Big Sisters of Central Arizona.

Robertson will be followed by The Bachelor's fourth-season star Bob Guiney, who will be hoping to make Food Finders some money. The Bachelor's Season 3 star Andrew Firestone will then follow suit and play for MOXI -- The Wolf Museum of Exploration and Innovation.

And last but not least, contestant Marquel Martin, who vied for Kaitlyn Bristowe's affection on The Bachelorette's eleventh season, will be playing for the Southern Nevada Chapter of Make a Wish.

News broke in April 2015 that Harrison would be replacing Terry Crews as host of the nationally-syndicated game show. Harrison first appeared on Who Wants to Be a Millionaire in that role for its fourteenth season back in the fall.

Millionaire is produced by Valleycrest Productions Ltd. and distributed by Disney|ABC Home Entertainment and TV Distribution. James Rowley serves as executive producer.