The Formula One ace was at the testing track in Spain when it was revealed the couple had mutually decided to end their seven-year on-off relationship.
This morning, the British racer was seen pulling his suitcase through Heathrow Airport after jetting into London.
Lewis, 30, has not spoken out on the split but Nicole, 36, confirmed it this week, saying she was "devastated" their romance was over.
Former Pussycat Doll Nicole told The Sun: "It was the hardest decision we had to make but we made it together. I love Lewis and I love he loves me."
Nicole didn't comment on rumours the relationship broke up because of Lewis' reluctance to get married and have children.
But it might not be the end for them… the duo do have a history of briefly splitting only to reunite soon afterwards.
Just before the split was announced, Nicole had spoken to The Daily Telegraph and insinuated at her career affecting relationships: "I look at this as a great blessing for me to be able to take on this role… but I have made sacrifices. This is very time consuming. I've left LA, left all my friends and my family. It's sacrificing your time in relationships, with loved ones, and my work..."
She was pictured on Wednesday heading to a performance of her musical Cats, which she stars in until this weekend.
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