Being the first family of hip-hop, rumours follow the Carter family's every move.

Stories about Beyoncé and Jay Z's marriage reportedly being on the rocks were rife this summer but now social media is buzzing with talk of a second baby.

So could reports that Bey and Jay are expecting another baby be true?

Rumours of baby no.2 began to circulate after Jay Z allegedly changed some lyrics to his song,Beach Is Better, during his Friday performance in Paris as part of their joint On The Run tour.

The rapper reportedly changed a lyric in the Magna Carta Holy Grail track to suggest that Bey was pregnant again.

Jay is said to have ad-libbed a line in one of the verses, and rapped: "cause she pregnant with another one."

There's no footage to back up the lyric change, but numerous sites have picked up on the reports.

So could Blue Ivy be getting a little brother or sister? The couple have announced their baby news on stage before - but were more direct last time.

Bey made a statement announcing her first pregnancy, dropping the mic and unbuttoning her jacket to reveal her growing baby bump live onstage at the 2011 VMAs.

There's been no word from the couple's rep on the reports, but keep it locked to MTV News for the latest on their response!