(REUTERS) - Pope Francis was serenaded by 150 seminarians at the Saint Charles Borromeo Seminary near Philadelphia on Saturday (Sept 26).

The seminarians also sang "Happy Birthday" to Philadelphia Archbishop Charles Chaput.

The pope arrived at the seminary after attending morning Mass at the Cathedral Basilica of Saints Peter and Paul.

He will have lunch at the seminary and rest before heading to Independence Hall to hold a rally there with Hispanic and other immigrants on the theme of religious freedom.

On Sunday, the pope will wrap up his six-day US trip with a Mass outside the neoclassical Philadelphia Art Museum expected to attract about 1.5 million people.