This <em>Big Bang Theory</em> couple is still trying to convince us they're not dating IRL

Los Angeles - Kaley Cuoco insists she isn't back with Johnny Galecki.

The Big Bang Theory co-stars - who previously dated for almost two years until 2010 - appeared very close at the People's Choice Awards in Los Angeles on Wednesday night, holding hands and embracing as they posed for pictures, but the 30-year-old actress says their relationship is purely platonic.

Posting a photo of herself and Johnny on Instagram, she wrote: "Thank you for the @peopleschoice award!! Look how happy we are!! @bigbangtheory_cbs season9 #mydate #notdating (sic)"

The former couple have been subject to reconciliation rumours for months following Kaley's split from husband Ryan Sweeting, but have insisted there is nothing going on.

Kaley posted recently: "So sorry to disappoint, but no home wreckers or secret flings going on here. Me and @sanctionedjohnnygalecki are just the best of buds - Leonard and Penny will just have to suffice!!! (sic)"

And Johnny shared: "No scandals / home wreckers / pregnancies here, y'all. Just profound friendship.(sic)"