Nicole Kidman has sparked pregnancy rumours after stepping out with her hands resting tenderly on her tummy in Japan.

The actress encouraged a fresh round of baby bump gossip when she cautiously covered her middle while posing for pictures on the red carpet next to co-star Hugh Jackman.

The 41-year-old - who already has seven-month-old daughter Sunday Rose - wore a black loose-fitted dress to the premiere of Australia in Tokyo, perhaps to hide a bump.

Could this mean another sibling for Sunday Rose?

See Nicole and Hugh on the red carpet below