It's obvious what Courtney Robertson has been doing since winning on "The Bachelor" (if that's really possible) and then getting dumped by Ben Flajnik -- working out.
The sexy 29-year-old showed off the amazing body that Ben's missing out on by wearing a pale green bikini on the beach in Los Angeles on Wednesday.
While she didn't get to walk down the aisle with Ben, Courtney will next appear on the wedding gown show "Say Yes to the Dress" ... but it's her sister who is the bride.
Courtney Robertson is about $80k lighter today -- because "The Bachelor" winner finally returned her diamond engagement ring to its rightful owner ... and photogs caught every glorious moment of it.
Robertson -- who called it quits with "Bachelor" Ben Flajnik last week -- hit up a Neil Lane jewelry store in L.A. Sunday to say sayonara to the 3-carat rock.
We're told the ring ended up back at Neil Lane since "Bachelors" and "Bachelorettes" don't foot the bill for their own marital swag -- i.e. when the relationship goes away, so does the bling.
But Court's not shedding too many tears over the loss (of the ring or Ben) -- considering she was recently seen sucking facewith "Bachelorette" cast-off Arie Luyendyk Jr.
Courtney Robertson is one helluva rebounder ... 'cause days after she split from "Bachelor" Ben Flajnik ... she was TOTALLY MAKING OUT with one of the rejects from "The Bachelorette."
TMZ obtained pics of Courtney sucking face with Arie Luyendyk Jr. -- who took 2nd place on last season's "Bachelorette" when he was shot down by Emily Maynard.
Of course, Courtney was SUPPOSED to marry Ben after he picked her on the "Bachelor" finale earlier this year ... but they split last week claiming things just weren't working out.
But it didn't take long for Court to move on ... 'cause Thursday night, she and Arie had dinner together at the fancy Quiessence Restaurant in Phoenix -- and we're told they were all over each other the whole time.
Former "Bachelor" Ben Flajnik and his current fiancée Courtney Robertson posed for a pic at MGM's Wet Republic in Las Vegas this weekend ... looking like two people who were forced to pose for a picture together.
Still trying to convince the world they are really in love, "Bachelor" Ben Flajnik and his chosen alleged soon-to-be bride Courtney Robertson actually hugged and kissed at the airport in San Francisco this weekend.
The reality TV dating competition show couple admitted they broke up after taping the finale but have since gotten back together and are engaged ... for reals ... right?
"Bachelor" winner Courtney Robertson has reached Phase 2 in her shameless quest for fame -- the part where she tries to make everyone believe she's SERIOUS about her engagement to Ben Flajnik.
A fully-clothed Courtney was out in L.A. moments ago ... telling paps, "We're engaged ... I love him." She also noted they have yet to set an actual wedding date.
During the finale last night, Courtney revealed she and Ben briefly split up after they finished taping the show ... but had since reconciled.
Amanda Bynes' arrest has most people thinking she's totally losing it ... especially after her wigtastic court appearance! But is she really off the rails -- you've gotta hear the new info we uncovered. Plus, war on the Jersey shore ... Snooki and Governor Chris Christie went…
![Amanda Bynes -- Arrested for Marijuana Possession and Bong Tossing [VIDEO]](http://ll-media.tmz.com/2013/05/24/0524-amanda-bynes-mug-shot-akm-117x81.jpg)
Will you accept this pose?
![Amanda Bynes -- Arrested for Marijuana Possession and Bong Tossing [VIDEO]](http://ll-media.tmz.com/2013/05/24/0523-amanda-bynes-video-cop-custody-still-article-wm-139x99.jpg)
![Jesse James -- Sooooooo ... I Cut Off My Pinky [PHOTO]](http://ll-media.tmz.com/2013/05/21/052113-jesse-james-tmzlive-primary-139x99.jpg)
