The Luther actor could become a father for the second time, with his partner Naiyana Garth said to be pregnant with his child.
A source told the Sunday People newspaper: "Idris and Naiyana are so in love and this is the icing on the cake for them.
"They had been keeping it quiet as it's early in the pregnancy, but they've told family and friends and Naiyana is beginning to show."
It was only recently confirmed Idris - who has an 11-month-old daughter Isan with his ex-wife Dormowa Sherman - was in a relationship with the make-up artist.
The couple - who have now been together for several months - both "feel lucky" to have found each other and are looking forward to the new arrival.
The insider added: "She is absolutely lovely and she's looking radiant. Her and Idris are a great couple and feel lucky to have found each other.
"Obviously Idris is a bit of a TV heartthrob so Naiyana is the envy of women across the country.
"But the truth is Idris is the one who really considers himself the lucky one. He's a great dad and she'll be a brilliant mum. They can't wait for their new arrival."
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