Millions of Muslims are preparing to observe Eid al-Adha, the second of two major Islamic holidays. According to the lunar-based Islamic calendar, the festival which commemorates Abrahams willingness to sacrifice his son Ishamel as an act of submission to God, kicks off on the evening of 22 September.

IBTimes UK looks at some notable Muslim celebrities joining the festivities.

Zayn Malik

Although former One Direction star Zayn Malik rarely speaks about being a Muslim, he did reveal that he suffered racist abuse on social media as a result of his beliefs. "Nasty things were said, like I'm a terrorist. How can you justify that?" he told the Daily Mirror. "I believe that your religion should be between you and whoever your belief is in."

Zayn Malik
Zayn Malik Kevin Winter/Getty Images

Janet Jackson

Singer Janet Jackson left behind her Christian upbringing after getting married to billionaire businessman Wissam Al Mana in 2013.

Janet Jackson and husband Wissam Al Mana
US singer Janet Jackson and businessman Wissam Al Mana. Reuters

Shea 'Ice Cube' Jackson

Rapper and actor Ice Cube converted to Islam in the 1990s. In 2014 the former N.W.A member said: "What I call myself is a natural Muslim, because it's just me and God. You know, going to the mosque, the ritual and the tradition, it's just not in me to do. So I don't do it."

Ice Cube
Ice Cube. Reuters

Jemima Khan

Vanity Fair editor-at-large, Jemima Khan, who became a Muslim a few months after she married Pakistani cricketer and philanthropist Imran Khan in 1995, completed Hajj in 2007 following their divorce.

Jemima Khan
Jemima Khan and her former husband Imran Khan Getty

Shaquille O'Neal

Although retired NBA star O'Neal has never publicly confirmed his faith, in 2010 he revealed plans to take the Islamic pilgrimage known as the Hajj to Mecca, Saudi Arabia. The Saudi government bars all non-Muslims from visiting Mecca.

Shaquille O'Neal
Retired NBA star Shaquille O\'Neal REUTERS