Crump is also an actor and is another touted as a future star.
The funnyman delights viewers with his brutal commentary about the islanders' dating habits, but his own love life appears to be just as interesting.
Poehler and Arnett were married for nine years and share two sons: Archie, 6, and Abel, 5.
She was also pictured partying with Hollywood star Leonardo Di Caprio after last year's BAFTA awards.
But it seems that Iain and Laura only have eyes for one another now, as the source added: "They are very much in love and are boyfriend and girlfriend."Iain has become a central part of Love Island thanks to his witty voiceovers.
Speaking about his hosting gig, the comedian said: "I show up, watch the show, think of some funny things to say and then speak over people having sex with each other."I get to go to Majorca for six weeks and chill.
I never thought my life would come to this but it has.