Jennifer Aniston was spotted earlier this week with a diamond on her right hand.  And even though an engagement ring is supposed to be worn on the LEFT ring finger, people were speculating that she and Justin Therous were engaged.  They're not.  According to "People" magazine, that diamond is a ring she's had . . . and worn . . . on and off for years.  She does have a gold band on her left hand, and Justin has a matching one.  But they've had them since they started dating and they're NOT engagement rings.

Kelly Osbourne has a problem:  Her boobs are shrinking.  She recently Tweeted, ''Why do they call it a Wonder Bra?  I think it's 'cause when it's off you 'wonder' where your boobs went!  How is it I was DD at 18 & at 27 I'm a B?"   Then she added, "'Off to the [gym] maybe my empty sacks of [crap] that I call [breasts] will get even smaller! #awesome''  You have to wonder if Kelly's mammary woes contributed to her recent breakdown on a plane from L.A. to Atlanta last week.  A source says that when Kelly boarded the plane, she looked gorgeous . . .  "Her makeup was impeccable, her hair was up in a smart-looking bun and she was wearing cool shades."  But after receiving several alcoholic beverages during the flight, that changed.  Here's the situation after the plane landed . . .  "Kelly's hair was hanging down, she was mumbling and her makeup was a mess.   "A guard and her assistant supported her under each arm and basically carried her down the corridor to the airport tram, with Kelly swaying from side to side."  After the flight, Kelly Tweeted, quote, "Had a nerves breakdown yesterday that was cool!  #Not."  The source says her brother Jack's recent MS diagnosis was mainly responsible.

Paris Hilton got knocked into a wall Tuesday night during a scuffle with the paparazzi in a parking garage.   Paris was leaving a West Hollywood nightclub with some friends, when a cameraman got a little too close for her taste.  Paris went after the guy's camera, and chaos ensued.  Paris' people tried to grab the guy's camera, and he got pushed into Paris and she hit the wall.  She wasn't injured, and police weren't called.  Here's video of how it all started, with Paris reaching for the guy's camera.

"Us" magazine says Oprah has agreed to appear on an episode of "Keeping Up with the Kardashians".  There's no airdate yet.  Oprah just interviewed the whole family for "Oprah's Next Chapter".  She claimed she had to do a "Kardashian Kram" because she hadn't seen their shows before the interview.  But "Us" says Oprah became "so enamored" with the family that she signed a release to allow footage of her to be used on the show.

Katy Perry is busy promoting her 3-D concert movie, "Part of Me" . . . and it sounds like she needs a break.   She says,  "I'm going into hiding.  I want to go and write songs in the woods or something . . . I'm gonna unplug, take my hair extensions out, feel my head again.  I'm gonna unplug and recharge, if that makes any sense.   "I'm gonna go away . . . it's time for me to go the [eff] away."  There's video from this interview on MTV.com.