Jay Z has hinted that Beyonce is pregnant with the couple's second child.

The hip-hop star - whose relationship has been the subject of much speculation over the last few months - performed the song 'Beach is Better' at a recent concert in Paris, but perhaps telling, changed the lyrics to say, ''cause she's pregnant with another one'', Radar Online reports.

A source told the magazine: ''For the last month, Jay has been fiercely protective of her, just like when she was expecting Blue Ivy [the couple's daughter].

''He's been doing everything he can to ensure that Bey is in a stress-free bubble.''

What's more, the source revealed that their entourage has been told to speak in ''relaxed'' voices and also to only listen to ''soft music''.

Despite rumours of a split, Beyonce and Jay Z have appeared happy in public, with the 'Crazy In Love' singer recently saying she's her husband's ''biggest fan''.

And Jay returned the compliment on the last night of their 'On The Run' tour, saying: ''It's been an honour and a pleasure to share the stage with you.

''I couldn't dream for anything else [than] to be in this stadium with the woman I love, who I believe is the greatest entertainer of our time. I love her. She's my wife.''