John Travolta tried to sexually assault Grease co-star Jeff Conaway while he was sleeping, Vikki Lizzi has claimed.

John Travolta allegedly tried to perform an oral act at Jeff Conaway’s home in the 1990s, Conaway’s former fiancée Vikki Lizzi told the National Enquirer.

Vikki Lizzi said that her partner, who played Kenickie in the 1978 hit movie, was so upset with the incident it ended his long-term friendship with the star.

She also said Jeff Conaway made the claim in a suicide note.

It was left, Vikki Lizzi said, after a failed bid to kill himself in 2006. He died on May 2011, aged 60, from complications of pneumonia.

Vikki Lizzi also alleged that Jeff Conaway said John Travolta, 58, and his wife, Kelly Preston, were locked in a sham marriage.

She told Star magazine: “Jeff told me that John and Kelly’s marriage was an arrangement.

“Jeff said that Kelly knows that John is gay, and that’s why she’s OK with it.”

Another source alleged in Star that Kelly Preston signed a contract with John Travolta when they were wed, though the source did not know its details.

The claims came as another hotel masseur claimed he had a homosexual tryst with John Travolta.

Vikki Lizzi said that Jeff Conaway, who played Kenickie in Grease, was so upset with the incident it ended his long-term friendship with John Travolta

Unlike the first two – one of whom withdrew his lawsuit on Tuesday and the first accuser who dropped his case – this latest man to come forward with gay sex claims involving the actor is named.

Former massage therapist Luis Gonzalez said he spent an afternoon with John Travolta at the Ritz-Carlton Hotel in Laguna Niguel, California, in 1997.

Meanwhile, another unnamed man made claims yesterday that John Travolta accosted him – making it the fifth man to make allegations about the star.

The man – a gym employee – has accused John Travolta of fondling him against his wishes when he worked out at the gym while he was shooting a movie, according to RadarOnline.

However, no details were reported regarding the time frame or location. John Travolta’s lawyer Marty Singer has denied the allegations.

Last week Fabian Zanzi became the third man to accuse Travolta of accosting him back in 2009 while he was working on the Royal Caribbean cruise ship.

Luis Gonzalez made his claims to the National Enquirer magazine in the US, saying of John Travolta: “He’s a great kisser. I know because I had sex with him and he loved it.”

He also claimed that the married actor seemed “very experienced” at gay sex.

“I can remember it like it happened yesterday,” he added.

The masseur said the rendezvous started minutes after he set up his table in John Travolta’s room.

The actor reportedly stripped down and said it was too warm for a top sheet.

Luis Gonzalez, 49, described how John Travolta became aroused soon after lying on the table.

“He moved around and started to breathe heavily,” he alleged.

“We got right into the bed that was right there next to the massage table and had a really good time.”

Luis Gonzales, who is now living overseas, said he had massaged the actor several times since first meeting him in 1988 without anything sexual happening.

“Travolta may not identify himself as a gay man, but it doesn’t dismiss the fact that he likes sex with men .. and he’s experienced at it,” Luis Gonzales claimed.

“I was in shock for about a week afterward thinking, <<I can’t believe it! I had sex with John Travolta!>> I was hoping to see him again after that, but I never did,” he alleged in the Enquirer.

The first masseur who claimed last week that he was groped by John Travolta during a private massage in Beverly Hills in January was forced to drop his case after it emerged that the actor was 3,000 miles away in New York at the time of the alleged incident.

But he hired celebrity lawyer Gloria Allred yesterday and was said to be considering whether or not to re-file the lawsuit.

A second masseur who accused John Travolta of sexual battery at an Atlanta hotel in January has now also withdrawn from the suit.

The unnamed man – named only as John Doe #2 – has parted ways with lawyer Okorie Okorocha but may still pursue his case against the actor having also hired Gloria Allred.

“We are in the process of conferring with him regarding the next steps, which he may wish to take,” Gloria Allred said yesterday.