Nina Dobrev and Ian Somerholder still have ''chemistry'' despite their break-up.

The 'Vampire Diaries' stars called off their three-year relationship in May 2013, yet managed to good-naturedly laugh off winning the prize for Best Chemistry at the People's Choice Awards last night (08.01.13) thanks to their characters Elena Gilbert and Damon Salvatore's steamy on-screen romance in the hit TV show.

Taking the stage to accept their trophy, Ian enthused: ''Wow, this is crazy! Can you believe this is almost five years in the making?''

The 25-year-old brunette joked: ''You're right, yeah! But you know what's funny, Ian, is that at the beginning of the show, Elena actually hated Damon.''

Ian retorted, ''You were hooking up with my brother!'', referring to Elena's long-term relationship with Damon's brother Stefan (Paul Wesley), on the show.

There was no certainly no sign of bad blood between the pair, who played up to the audience's cheers by pretending to feel uncomfortable around each other as they referenced their real-life break-up.

Nina continued, ''Then we broke up in real life,'' with Ian chiming in, ''And yet our characters are still dating on the show'', before she replied, ''It's a good thing it's not awkward...''

The 'Lost' hunk then spontaneously planted a smooch on Nina's cheek as she giggled, ''Well, it's a good thing we have chemistry!''

The exes - who are constantly subject to rumours about getting back together - were visibly on very good terms during the ceremony and Ian even shared a special birthday message for Nina on Twitter this morning (09.01.14).

He wrote: ''Happy Birthday @ninadobrev!!! The world loves you! We all do. Enjoy the moment, enjoy the day, enjoy the year!''

Disappointingly for fans of the show, Nina was spotted holding hands with a mystery man as she arrived on the red carpet before the ceremony.