'Bachelor' Ex Courtney -- How Do Ya Like Me Now?

Will you accept this pose?

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.