Yes, Elvis cheated on Priscilla by having an affair with Ann-Margret, his beautiful co-star in the 1964 movie Viva Las Vegas. Their steamy relationship caused great heartbreak and trust issues inside Elvis and Priscilla’s marriage.

How Priscilla Entered Elvis’s World

First, some important backstory. Elvis met his future wife Priscilla Beaulieu in 1959 while serving in the army in Germany. Despite their age gap – Elvis was 24 and Priscilla only 14 – they soon fell in love.

After Elvis finished his military service in 1960, he and Priscilla had a long-distance relationship, staying in touch through phone calls and letters. Finally in 1963 after lots of convincing, Priscilla’s strict parents allowed her to move to Memphis to finish high school near Elvis’s famous Graceland mansion.

To ease their worries about her living there, Elvis made rules: Priscilla would stay with his father, not him. And she had to enroll in a strict all-girls Catholic school. But Priscilla quickly ended up at Graceland with Elvis anyway, struggling to balance her studies with his wild rock star lifestyle and late nights.

In 1967 when Priscilla turned 21, she and Elvis finally married in a glitzy Las Vegas ceremony. She became Mrs. Priscilla Presley, consort to the King himself. But their happiness soon faced threats…

Introducing Ann-Margret – The Temptress Co-Star

In 1964, stunning Swedish actress Ann-Margret was cast as Elvis’s leading lady in the fun musical Viva Las Vegas. With her bold confidence, hourglass figure, and shock of red hair, she immediately drew comparisons to 1950s icon Marilyn Monroe.

Upon meeting Ann-Margret, Elvis became instantly infatuated with her looks and charm. And working so closely together on set, it didn’t take long for things to turn romantic behind the scenes. As they sang and danced in the Vegas spotlight, Elvis was utterly seduced by this dynamite diva.

Meanwhile back home, Priscilla anxiously wondered whether Elvis would remain faithful to his child bride or stray with his sexy movie co-star. Her worst fears came true – Elvis couldn’t resist Ann-Margret’s formidable charms. Away from Priscilla’s watchful eye, The King gave in to temptation.

The Proof Emerges – Elvis Cheats!

At first when rumors erupted, Elvis denied carrying on an affair with Ann-Margret behind Priscilla’s back. But Priscilla’s womanly intuition suspected otherwise as Elvis grew increasingly cold, distant and short-tempered with her.

Still, Priscilla’s young age and worshipful love for Elvis left her naive. The master manipulator insisted she was simply being paranoid and jealous. So loyal Priscilla squashed her doubts and worries, trying to preserve her fairy tale marriage to the King.

Finally concrete proof landed – a photo spread in a gossip magazine showed Elvis with his arms possessively wrapped around a smiling, relaxed Ann-Margret. Deep down, Priscilla knew then that Elvis had lied all along about cheating with his glamorous costar.

Why Ann-Margret Threatened Elvis and Priscilla’s Marriage

Why did Elvis work so hard denying his affair with Ann-Margret instead of confessing to Priscilla?

Perhaps because Ann-Margret herself aimed to become the new Mrs. Presley, even telling the press she adored Elvis and dreamed of marrying him. As filming ended, Ann-Margret clearly hoped to continue their romance back in Hollywood, cementing her place at Elvis’s side.

Her bold declarations forced Elvis to take drastic action – he abruptly dumped Ann-Margret rather than let her jeopardize his carefully controlled image. As much as he desired her, Elvis wasn’t ready to having a wife with such confidence and ambition that challenged his dominance as leading man both at home and in Hollywood.

How Priscilla Finally Found Her Strength

After Elvis viciously assaulted her one dark night, Priscilla walked out on Graceland without looking back. She built a new life focused on mutual caretaking with daughter Lisa Marie instead of Elvis’s endless demands.

Finally exploring her own dreams nurtured Priscilla’s broken wings. Studying karate to regain confidence led to instructor Mike Stone becoming her romantic partner. Starring in TV shows revealed fresh talents beyond Mrs. Presley.

By summoning courage as both a survivor and mother, Priscilla proved she could stand tall without Elvis’s damaging shadow looming over her anymore. Leaving Graceland finally set her free.

So in the end, loyal Priscilla displayed true grit starting over wiser and stronger. And she moved forward with grace, never publicly trash talking Elvis as some bitter ex-spouse despite his awful behavior.