The former Pussycat Doll celebrated the holiday at the home of the Formula One racing pro's father on Thursday (28.11.13) and she spent the night with her ex-boyfriend.
A source told the Sunday People newspaper: ''Lewis invited Nicole over because he wanted to make sure she had a happy Thanksgiving and she wasn't lonely.
''So he and Anthony asked her round. They celebrated and then she stayed the night the night. She and Lewis had a lovely time and she definitely left with a big smile on her face.
''They have stayed friends since the split. They were both heartbroken. They're getting their relationship back and both are delighted.''
Away from her personal life, Nicole has been working with British singer-songwriter Tom Odell as she looks to release a more ''stripped back'' album.
She told The Sun on Sunday newspaper: ''I've been working on this music project with Tom which no one is going to expect.
''No one has heard my serious stuff - it's stripped back and the singer-songwriter side of me.
''It is very important to me. I've got a handful of songs in my back pocket. I'm just waiting for the right time to launch it., I want to get it out there.''
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