Marilyn Monroe was putting both Kennedy brothers to bed after she sang “Happy Birthday, Mr. “President”

Shirley MacLaine claims that Marilyn Monroe went to bed with both John F. Kennedy and his brother Robert on the same night.

The 90-year-old Oscar winner makes a scandalous statement in her new book about coffee: “The Wall of Life: Photos and Stories from this Wonderful Life”, which features a photo from May 19, 1962 – the night Monroe breathlessly sang “Happy Birthday, Mr. President” to JFK.

MacLaine was present at the event and claims she was at the afterparty where she saw President Kennedy emerge from the bedroom with Monroe inside.

Shockingly, MacLaine claims that Robert F. Kennedy – who was then serving as United States Attorney General – entered the room immediately afterwards, presumably to have sex with the “Some Like It Hot” star right after his siblings did so.

“In 1962, at John F. Kennedy’s famous 45th birthday celebration at Madison Square Garden, Jimmy Durante and I performed before the president and the audience, but most people remember Marilyn Monroe singing ‘Happy Birthday’ to him,” MacLaine writes in her book.

“Later, there was a private party at the home of (Democratic Finance Chairman) Arthur Krim…Jack Kennedy had just come out of the bedroom behind me and Bobby (Robert) Kennedy had just come in. Marilyn was in the bedroom.”

Monroe died just three months later. President Kennedy was assassinated late the following year.

In his new book, MacLaine also shares another photo that suggests both JFK and RFK are up to no good.

Under a photo taken in 1984, he writes: “I tell this story to Teddy Kennedy… and he laughs at how boys get away with it all the time.”

MacLaine isn’t the first to allude to the Kennedy brothers being involved in an affair with Monroe the evening she sang “Happy Birthday, Mr. President.”

In his new book titled “Don’t Ask: Kennedy and the Women They Destroyed” Former Post columnist Maureen Callahan claims that 30 minutes before Marilyn sang for JFK, she had sex with Robert in her dressing room.

“They spent 15 minutes alone together,” Callahan writes in his book.

She claimed that the actress appeared on stage “drunk and flushed from the transgressive sex she had just had with Bobby (Robert), and her dress was so tight she could barely walk.”

Callahan then claimed that First Lady Jackie Kennedy was “furious” after the performance, which caused JFK in the audience to “drop his jaw.”

The author wrote to Jackie and then gave her husband an “ultimatum.” She banned him from seeing Monroe again, saying she would “divorce him – taking the children and costing him a second term (in the White House).”

However, according to Callahan, Monroe’s relationship with RFK continued.

RFK allegedly visited Monroe on the night of her death at her Los Angeles home: August 4, 1962.

“Bobby and Jack discovered that the FBI and CIA had bugged Marilyn’s home and phone line without her knowledge…Bobby did not leave without the recordings,” she wrote.

Meanwhile, the Kennedys aren’t the only politicians MacLaine writes about in his new book.

The ‘Terms of Endearment’ legend revealed the ‘horrific’ meeting she had with Donald Trump.

“I probably had contact with Donald Trump in the 1980s,” she wrote. “I was at some party and when he came in, he saw me and straightened up. He started pulling on my tie and I immediately noticed that he was mentally taking off my clothes… and his own.

“It was terrifying how obvious he was,” MacLaine said.” “He even came up with a way to stop me from leaving, but I had to get out of there.”