Katy Perry has revealed that she is back in the recording studio.

However, it seems the US star had a busy start to the week, with the 'Prism' star also helping to deliver her sister's baby.

The 'Prism' icon took to Twitter on Monday (September 12) to reveal that she had juggled her sibling's birth with studio time.

Perry said: "Helped deliver my sister's baby at 2pm & am in the studio by 8pm.

"GET A GIRL THAT CAN DO BOTH!"

The singer meanwhile recently said on Twitter that she would collaborate with Taylor Swift - but only on one condition.

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