SHE’S nun too happy.

A nun taking an afternoon walk was allegedly robbed at knifepoint by a married lesbian couple who fled with her rosary beads.

Quincy Police say a sister at the Daughters of Mary of Nazareth convent was wearing civilian clothes and carrying a small bag when she was held up on Phipps St, in the US state of Massachusetts, on Sunday.

A woman identified as Vanessa Young, 26, allegedly approached the Roman Catholic nun with a knife and tried to snatch the satchel, WCVB reports.

When the nun said she didn’t have any money, Vanessa Young apparently said: “I’m not going to hurt you.”

Police said the nun showed Vanessa Young that she was only carrying rosary beads, a key and a small memento. The alleged thief then apparently said: “I’ll guess I’ll take the rosary beads.”

Police said Vanessa Young fled with her wife, 26-year-old Crystal Young, who had been standing nearby acting as a lookout.

The nun ran back to the convent before calling police, who nabbed the married couple shortly later. Police said the women were carrying a small knife, six mobile phones and a stolen chequebook — but no rosary beads.

Vanessa Young is scheduled to be arraigned on Monday on charges including assault with a dangerous weapon. Crystal Young is accused of being the lookout, and is charged with armed robbery and accessory after the fact.

According to Facebook, Crystal and Vanessa Young are married and live in Massachusetts.