Sienna Miller and Balthazar Getty back on

Sienna Miller is back to being the other woman. She’s reunited with her former lover Balthazar Getty in Italy. He even brought his mother along for the fun.

The on-off couple have been spotted on vacation in Positano in the south of the country. Friends say Sienna and Balthazar have reconciled after splitting a month ago.

“They’re ready to put their troubles behind them,” said a source.

For those who may have forgotten, the couple hooked up last year, back with Getty was married with four children. He separated from his wife, Rosetta Millington, and got himself written off “Brothers and Sisters”

The “G.I. Joe” actress and Getty’s mother Gisela arrived in Positano on Friday and he joined the party Sunday. The couple took a boat to nearby Nerano, where they spotted kissing over an intimate lunch.

“Sienna was nibbling on his ear. Even when the food arrived her appetite was only for her man,” said the source.