Title: List of Celebrity Big Brother (British TV series) housemates
Content: Ages at the time the celebrity entered the house 
Title: Celebrity Big Brother (British series 8)
Content:  The show went live on 18 August. A group of ten initial housemates entered the house through the big eye via a catwalk leading up to a flight of steps, crossing a swingbridge shaped like the Big Brother eye. Marcus Bentley narrated each contestant's details as they made their entrance. Kerry Katona was announced as the first celebrity housemate to enter the new Big Brother house followed by American Pie actress Tara Reid Reality TV stars Paddy Doherty from My Big Fat Gypsy Wedding and Amy Childs from ITV 2's The Only Way Is Essex joined them. Australian paparazzi and media personality Darryn Lyons was next to join the house followed by Sally Bercow. British actor Lucien Laviscount was next with ex Baywatch actress Pamela Bach preceding him. British model Bobby Sabel was next, with Irish pop duo Jedward the last to enter the house.
Title: Big Brother (Polish season 5)
Content:  Nine celebrity housemates entered the house on Day 1, March 2, 2008. And on Day 8, March 9, 2008, two celebrity housemates entered the house.
Title: List of Celebrity Big Brother (American TV series) episodes
Content:  Celebrity Big Brother, also known as Big Brother: Celebrity Edition, is the American adaptation of the reality competition television franchise Celebrity Big Brother, which was created by John de Mol. The series premiered on CBS as counterprogramming to NBC's coverage of the 2018 Winter Olympics on February 7, 2018. The series has aired for two seasons and focuses on a group of celebrities, known as HouseGuests, that live in a purpose-built house, known as the Big Brother house, with no contact from the outside world for approximately a month. The HouseGuests try to avoid eviction with the aim of being the last remaining HouseGuest in order to win a grand prize of 
Title: Big Brother (franchise)
Content:  task (Big Brother 11); Pamela Anderson entering as a guest for 5 days (Big Brother 12); a professional actor posing as a housemate and a mother and daughter as contestants (Big Brother 14); one contestant gets a pass to the final (Big Brother 15); first night eviction (Big Brother 16); two houses with "the other house" featuring enemies from the main house housemates past (Big Brother 17); Jackie Stallone entering a house containing her son's ex-wife Brigitte Nielsen (Celebrity Big Brother 3); a "fake celebrity" (a civilian contestant pretending to be a celebrity) in a celebrity edition (Celebrity Big Brother 4); a visit from Jade Goody's family (Celebrity Big Brother 5) and unlocked bedrooms allowing housemates to immediately claim beds with 
Title: Celebrity Big Brother 2 (American season)
Content:   The twelve HouseGuests were announced on January 13, 2019 during a commercial break of CBS' NFL football coverage. Tom Green became the first Canadian to enter the US Big Brother house.
Title: List of Celebrity Big Brother (American TV series) episodes
Content: For Keshia's eviction, see ; For Shannon's eviction, see ; For Metta's eviction, see ; For Brandi and James' eviction, see Season one aired from February 7, to February 25, 2018. Ariadna Gutiérrez, Brandi Glanville, Chuck Liddell, James Maslow, Keshia Knight Pulliam, Marissa Jaret Winokur, Mark McGrath, Metta World Peace, Omarosa Manigault, Ross Mathews and Shannon Elizabeth were revealed as the celebrity HouseGuests on January 28, 2018 and entered the Big Brother house on January 31, 2018. The first season introduces the concept of Celebrity Big Brother where a group of celebrities, known as HouseGuests, live in a purpose-built house, known as the Big Brother house, with no contact from the outside world for approximately a month. The 
Title: Celebrity Big Brother 1 (American season)
Content:  20, 2017. The logo is similar to that used for Big Brother 19, with the word "celebrity" added. The first teaser was also released the same day. In January 2018 official photos of the house and backyard were released through a press release and an Instagram livestream with Julie Chen. On January 28, 2018, the official cast was announced during the 60th Annual Grammy Awards. The first season officially concluded on February 25, 2018 when Marissa Jaret Winokur beat Ross Mathews by a final jury vote of 6 to 3. Ross was also later named America's Favorite HouseGuest. On May 12, 2018, CBS renewed the spin-off for a second season.
Title: Celebrity Big Brother 1 (American season)
Content:  Brother would air sometime during the winter, before the twentieth season of Big Brother in the summer of 2018. CBS later confirmed via a press release that Julie Chen would return to host the new season, and Allison Grodner and Rich Meehan will be executive producers. The season will be produced by Fly on the Wall Entertainment in association with Endemol Shine North America. On September 13, 2017, it was revealed by Chen that her husband, CBS chief executive Leslie Moonves, forced her to take a pay cut for the celebrity edition to happen. Moonves stated, "You shouldn't be expected to be paid as if it's a full series. It's a condensed version."
Title: List of Celebrity Big Brother (British TV series) housemates
Content:  On some occasions, celebrities have entered the house for a short period of time as guests.

Question: when did the celebrities enter the big brother house?
Answer: February 7, 2018.
2017.