Clarke and a number of his Hollyoaks colleagues shot a special scene at a Wretch 32 gig yesterday evening for the climax to an ongoing love triangle storyline.
Storming the stage to the surprise of Wretch 32's fans, Bart grabbed the microphone from the rapper and confessed his love for ex-girlfriend Sinead. The scenes will air on screen later this week.
Reflecting on the experience, Clarke told Radio 1 today: "Oh my God, I was so nervous… The moment I got on stage, the nerves hit me. The crowd thought it was real at first and then they cottoned on."
Stephanie Davis, who plays Sinead, added: "No-one knew, so everyone thought it was a random person getting on the stage. They were like, 'Oh my god, what's going on?' And then I think they realised it was him!"
This week's Hollyoaks episodes build up to the live stunt as Sinead considers leaving the village with new boyfriend Gaz (Joel Goonan) after they land jobs selling gig merchandise on Wretch's tour. Viewers will find out on Friday whether Bart's gesture is enough to win Sinead back.
Wretch 32 today praised Hollyoaks for attempting the stunt.
"I think it's definitely the next level of filming and for television," he commented. "To attempt to do something like that, it looks like it technically wouldn't work because anything could happen. A lot of shout-outs to Hollyoaks for doing it."
Davis added: "I think we're taking [Hollyoaks] to a different level now. It's been so good with the Silas storyline and now we're showing we can take it to different places."
Hollyoaks airs the surprise scenes on Friday at 6.30pm on Channel 4.
> Hollyoaks films Bart, Sinead scenes at Wretch 32 concert
> Hollyoaks cameo was priceless, says Wretch 32
> Read more Hollyoaks spoilers and news
Watch Bart invade the stage at the Wretch 32 gig in the video below: