As we've explained before, some actresses just seem to become mega stars one minute before vanishing from Hollywood without a trace.
It's not a case of their careers fizzling out, so there must be something to explain their disappearing act.
Shannyn Sossamon was one of the biggest names to hit the scene and then leave just a few years later.
As the actress reveals, people will often stop her to ask, "You look really familiar. Are you an actor? What you have been in?"
The answers are surprising, and so are Sossamon's reasons for leaving the limelight.
A Rising Star
The actress had moved to L.A. to study dance, and was working as a DJ and model before she was discovered by a casting director.
One night she was spinning records at Gwyneth Paltrow's birthday party, and her stunning good looks landed her a big part in a major film.
"Yeah, sounds naive and cliche, but that's exactly what happened to me," she explained.
Her breakout role was as Lady Jocelyn, Heath Ledger's love interest in A Knight's Tale, and Sossamon's performance made her a star overnight.
She received award nominations and praise for her performance, and followed it up with a leading role in the comedy 40 Days and 40 Nights starring John Hartnett.
That's two big parts as the leading lady in back-to-back hit films. But by now you're probably struggling to remember what comes next for Sossamon.
In fact, she co-starred with Ledger again in the little-seen horror thriller The Order - Sossamon says the late actor was "a very special spirit."
After the film wrapped, Sossamon became pregnant. She later admitted the pregnancy took her by surprise, and it led to an acting hiatus that lasted for years.
But Sossamon hasn't dissapeared from Hollywood completely, and you might have seen her in some recent shows and movies that have slipped your mind.
Family Comes First
Sossamon gave birth to her first son, Audio Science Clayton (his father was children's book author Dallas Clayton) in 2003.
The actress later told Nylon that her son "completely grounded me and made me look at myself, and my life just became completely different. It was just a gift, and perfect timing, too."
Sossamon took time to focus on her son and didn't return to acting until 2005. By then, her career had cooled down, and she mainly appeared in short films and indie movies.
While she had a small part in The Holiday and was the lead in some straight-to-DVD horror movies, Sossamon's attention was devoted to her son, and another side project.
Sossamon and her sister are part of the band Warpaint, and she put her acting career on the back burner for four years to focus on making music.
"Everything came completely to a total stop"
Sossamon had a leading role in the horror remake One Missed Call, and appeared on TV shows like Mistresses, Wayward Pines, and Sleepy Hollow.
While the actress admits she's not a horror fan, she says she doesn't mind being typecast as a scream queen - even if she was once a leading lady.
"The only reason I've done a lot of genre is because it comes to me, and you have to work," she told Uproxx.
"And you know, some have gone better than others."
Sossamon also admits that she feels like she missed her chance at stardom, insisting that even in her early career she was never really "famous."
"I know in the beginning, I was 21, and I had done four big films, one after the other," she remembers.
"But when I had my boy I just kind of, I completely, everything stopped. Everything came completely to a total stop."
Still, the proud mom says that was "a blessing in disguise."
"I’m a creative person," she told Nylon in 2015, "so there are other things I can do and I can be easily distracted."
"But [acting] felt like it was supposed to be. I like to think it chose me instead of me choosing it, and I think I’m taking that very seriously now."
Feeling old yet?
While we're taking a trip down memory lane, let's remember Sossamon's frequent co-star, Heath Ledger.
Before he passed away, the talented young star had a daughter with actress Michelle Williams.
The couple met on the set of Brokeback Mountain, and Williams said it was "love at first sight."
In fact, the couple welcomed their daughter, Matilda, just two years later.
Despite the fact that Ledger and Williams split before his death in 2008, he was on good terms with the actress and his then two-year-old daughter.
A decade after her famous father passed away, Matilda is now 12, and many say they see a resemblance to her late dad.
With two talented actors for parents, maybe she'll take up the family business someday.
While we're remembering classic actresses, do you remember the great Lori Petty?
And here are 15 more great actors we totally forgot about.