She doesn’t have a care in the world.

The 3-year-old daughter of Marathon bomber Tamerlan Tsarnaev frolicked in her grandparents backyard this morning — apparently oblivious to the horror committed by her terror-loving father.

The cute toddler was spotted playing on a slide with her grandmother, who shooed her back inside when she saw reporters on the street in front of the house in Rhode Island .

The child’s mother, Katherine Russell, has been described as an all-American girl who was “brainwashed” by her radical husband, Tamerlan Tsarnaev, who is accused of carrying out with his brother last week’s horrific attack in Boston.

And her old roommates said Tsarnaev would taunt and abuse his stunning wife before they were married, calling her a “slut” and “prostitute,” according to a report.