Anna and Lucy DeCinque, the ‘world’s most famous identical twins’, are trying for a baby with the same man

Ben proposed to the sisters - who have been dubbed the world's 'most identical twins' - with matching rings in the latest episode of TLC's reality TV series, Extreme Sisters.

After taking the girls out for a romantic picnic, he popped the question with engagement rings stacked with three bands, which he said symbolises their special relationship as a trio.

The DeCinque twins are showcasing their extraordinarily interconnected lives in the American TLC network's new reality TV series, Extreme Sisters.

The program - which chronicles the lives and relationships of the DeCinques and four other sets of siblings - launched in the States on Monday and will hit Australian streaming services later this year.