The elderly ex-secretary of former Philippines First Lady Imelda Marcos has finally started serving jail time over the crooked multimillion-dollar sale of a Monet painting that belonged to her late boss — more than four years after she was convicted.

Vilma Bautista, 78, surrendered in Manhattan Supreme Court on Monday to begin serving a 2- to 6-year sentence.

She took Claude Monet’s 1899 work “Water-Lily Pond” and other works from a Filipino mission on the Upper East Side. Bautista then sold “Water-Lily Pond” for $32 million, and lied about it on her taxes, a 2013 jury found.

Bautista and her attorney maintained the works were a gift from Marcos, and she was cleared of stealing the Monet.

She was sentenced in 2014 on charges of conspiracy, tax fraud and offering a false instrument, but was allowed to remain out of prison pending appeal.