Gayle King exclusively told PEOPLE what she yelled while sitting in the front row at Pope Leo XIV's inauguration mass alongside Oprah Winfrey and Maria Shriver.

VATICAN CITY (AP) — Pope Leo XIV offered a message of love and unity during an inaugural Mass on Sunday in St. Peter’s Square before an estimated 200,000 pilgrims, presidents, patriarchs and princes.

Pope Leo XIV has taken the reins as leader of the Catholic Church, and on Friday, May 9, started his first full day as Pontiff with a mass at the Sistine Chapel, during which he called his election both a cross and a blessing.

An open-topped popemobile carrying Pope Leo XIV drove through St Peter's Square at the Vatican on Sunday morning, ahead of his inaugural mass.

Were Princess Charlene, Queen Letizia, Queen Mathilde and Grand Duchess Maria Teresa allowed to wear white at Pope Leo XIV's inauguration mass? All about the royal rule!

White House press secretary Karoline Leavitt told reporters that Vance passed a long a letter to the pope from President Donald Trump and first lady Melania Trump “extending their warm wishes and inviting him to the White House as soon as he possibly can” visit.

President Trump has invited newly inaugurated Pope Leo to the White House, Press Secretary Karoline Leavitt said on Monday. Why it matters: If accepted, the visit would mark the first time a pope has visited the White House since Pope Francis visited then-President Obama in 2015.

The service marks the official start of Leo's papacy just under a month after the death of his predecessor, Pope Francis. The ceremony began with a procession from St. Peter's Basilica — where Leo and other church leaders visited St. Peter's tomb to pray — to St. Peter's Square, where the Inauguration Mass was held.