Angelina Jolie and Brad Pitt have reportedly stepped up security after daughter Shiloh was targeted by kidnappers.

According to a U.S. publication, the couple “freaked out” after a photo of the 20-month-old tot, alongside a note warning: "We got this close already," was left at the door of one of their homes.

"Shiloh has someone protecting her 24-7, and Brad and Angie are trying to avoid taking her out of the house," says an insider.
 
"Someone got to their doorstep and left a threat against Shiloh. The person included a photo of her, and a note that read, 'We got this close already.'"

Shiloh has not been photographed in public since the chilling note was left in early January, Life & Style claims.

The insider has not revealed which residence was targeted, due to security reasons, but claims that the couple's already impressive security at their California home is being beefed up.

The source continues: "Brad and Angie will do whatever it takes to protect the children.

"There have been frequent threats against their kids, but this time someone just got too close.

"They are by far the most security-conscious celebrities in the world." 

Angelina and Brad have three other children, Maddox, six, Pax, four, and Zahara, three - and are rumoured to have twins on the way.