JUSTIN BIEBER and MILEY CYRUS were spotted hanging out in L.A. on Saturday night . . . so obviously, the rumors are flying.

Miley was partying at a club called Beacher's Madhouse, and Justin showed up a little before 2:00 A.M Sunday morning. 

He went straight to her table, and sources say they were "laughing and flirting."  They hung out for about 15 minutes before leaving.  It's not clear if they went somewhere together, or if they went their separate ways.

But earlier in the day, Justin's leopard-print Audi was spotted leaving Miley's house.  (You can see pictures of them at the club, and video of Justin's car at Miley's place, here.)

But Miley DENIED the rumors in an interview yesterday by saying, quote, "I'm engaged.  I'm engaged.  That is impossible."  (It was with Hot 99.5 in Washington, D.C.)

She was also asked about AMANDA BYNES . . . who's been attacking Miley and loving up on her fiancé LIAM HEMSWORTHon Twitter.

She said, quote, "I won't even entertain that thought.  It think it's all so sad that I don't want to add any fuel to that fire.  I was rooting for her comeback until she started attacking me."

(Meanwhile, Miley was spotted yesterday wearing a half-shirt with the word "Channing" on it.  Was it for Channing TATUM?)  (Daily Mail)

The Huffington Post just put together a list of the 100 best movie compliments of all time.  Here's a sample.  (They're mainly funny ones, from movies like "Blazing Saddles" and "The Naked Gun".  But they also included the "purty mouth" line from "Deliverance.)

CLICK HERE

The PARIS JACKSON 911 call hit the web yesterday.  It was made by the Lost Hills Sheriff's Department to the L.A. County Fire Department.

The caller said Paris, quote, "OD'd on 20 Motrin and cut her arm with a kitchen knife."  She didn't mention her by name, though.  She added that Paris was, quote, "awake and breathing."  (You can listen here.)

(Meanwhile, RadarOnline.com says Paris no longer wants any part in the wrongful death lawsuit against her dad's concert promoters.  You can read more about that here.)

With just one study, I think we can explain every single thing you've observed in your marriage . . . and all your friends' marriages too.