Carolyn Mitchell was one of those girls who seemed destined to make headlines. And did she ever.

Born with stars in her eyes in Phoenix in 1937, she moved to Los Angeles as a teenager.

While still in high school in Inglewood, the curvy teen adopted a new name, Barbara Thomason, and began entering bathing suit beauty contests from Hermosa Beach to Palisades Park.

She got her first headline after a Santa Monica pageant in June 1954: “Blonde, 17, Chosen Muscle Beach Queen.” She was described as “a bouncy, blue-eyed blonde in a white bathing suit,” with hourglass measurements recorded down to the half-inch.

Thomason won a roomful of beach beauty trophies, and that led to pin-up modeling. But she dreamed of acting.

In 1955, she made her screen debut (as Carolyn Mitchell) in an episode of “Crossroads,” an ABC morality-play series.

A few years later, she won a small part in the biker flick “Dragstrip Riot,” with Fay Wray. Next came a marquee-topping role in Roger Corman’s cult film “Cry Baby Killer,” the debut of co-star Jack Nicholson.

As those two B-movies flickered on silver screens, Thomason/Mitchell made another headline, on Aug. 12, 1958: “Starlet Takes Sleeping Pills at Mickey Rooney’s Home.”

Red Doff, Rooney’s flack, said he had a perfectly reasonable explanation — even if it wasn’t.

Thomason accidentally took some pills, he said. After she got woozy, she was stripped naked and dunked in Rooney’s pool by pals trying to revive her. Later they dumped her at a hospital, where she recovered.

“They’re just good friends,” Doff said. “(Rooney) has no thought of marriage.”

Good thing, since he was already married — to wife No. 4, actress Elaine Devry.

But Hollywood peepers were skeptical of the glossy veneer.

And no one was surprised when Thomason became Mrs. Rooney No. 5 in a secret service in Mexico on Dec. 1, 1958.

The bride was 21, the groom 38.

The union wasn’t legal since Rooney’s fourth divorce wasn’t yet inked, but they fixed that detail with a do-over ceremony five months later in L.A.

Thomason gave up her budding career to become a full-time mommy. She delivered four babies in exactly four years, beginning with Kelly Ann on Sept. 13, 1959, and ending with Kimmy Sue on Sept. 13, 1963, with two in between.

Whatever joy the children brought was tempered by Rooney’s financial swoon. He was broke, despite earning $12 million in hundreds of film roles over 35 years. He went bankrupt in 1962 as Uncle Sam dunned him for $100,000 in back taxes.

“Out of the money I earned, I’d say $10 million went to taxes,” Rooney told the press. “The rest is an open book. I’ve been married five times and had four divorces.”

His pet vices — booze and gambling — went unmentioned.

Rooney worked constantly to stay afloat, often on schlock projects — for example, as Peachy Keane in “How to Stuff a Wild Bikini.” (“The answer to a moron's prayer,” snarked one critic.)

When she married a movie star, Thomason must have expected a glamorous life. Instead, she was awash in diapers and on a tight budget, keenly aware that her husband had resumed another chronic bad habit: philandering.

Eventually, her eye began wander beyond the nursery.

In 1965, Rooney traveled to the Philippines to film “Ambush Bay,” a war drama costarring Hugh O’Brian. While Rooney was away, Thomason got cozy with a muscular young actor, a Yugoslav émigré named Milos Milosevic.

As their affair began, Milosevic’s movie career was taking off. He had a bit part in the “The Russians Are Coming, The Russians Are Coming,” and he played the title demon in “Incubus,” the William Shatner horror film done in the Esperanto language.

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Milos Milosevic shot himself in the head after killing his lover, Barbara Thomason. The murder made the Daily News front page on Feb. 1, 1966.

Rooney returned from the Philippines in November 1965 to discover that the demon had moved in while he was gone.

Rooney retreated to a hotel and filed for divorce. Barbara had second thoughts when she learned that he wanted custody of their children.

The couple met on Jan. 30, 1966, in a hospital room where Rooney was being treated for an intestinal bug. Thomason swore she would dump Milosevic, and Rooney surprised everyone by agreeing to reconcile.

Barbara then had to break the news to Milosevic, who was still shacked up in the Rooneys’ Brentwood home. The Yugoslav was known for a volcanic temper, and no one expected him to leave his lover meekly.

But friends who accompanied Thomason home said Milosevic seemed to take the news calmly. They went into the master bedroom together at about 8:30 that night.

The next day, when Thomason didn’t respond to knocks on the locked bedroom door, her friend Wilma Catania used a screwdriver to break in.

On the floor in the master bath, Milosevic was sprawled atop his lover. Thomason had been shot under the chin, Milosevic in the temple. Police judged it a murder-suicide at Milosevic’s hand, using a .38 pistol that Rooney kept for protection.

No one could explain why the shots were not heard, even though her children and a maid were in bedrooms just down the hall.

The tragedy created Thomason’s curtain-closer headline: “MICKEY ROONEY’S WIFE NO. 5 SLAIN.”

Her children were raised by Barbara’s mother. Rooney married three more times before he died this month at 93.