The on/off couple broke up in July last year but were rumoured to have met in secret since then.
Earlier this month the pair were pictured together in public when they dined out at Italian restaurant E Baldi in West Hollywood.
"Nicole and Lewis have been in contact for months. After meeting several times and discussing their relationship at length, they decided they didn't want to sneak around anymore," a source explained to British magazine Star.
"It was a special occasion, so they decided to go out together and let everyone know they are back together. It couldn't stay a secret forever."
At the beginning of January, Nicole and Lewis sparked rumours they were holidaying in Aspin, US, together when they posted very similar pictures of themselves skiing on Twitter.
The couple have been dating sporadically since 2008 and there was speculation their split was down to 29-year-old Lewis not being ready for marriage and a family with Nicole, 35.
Now they are reportedly ready to put the past behind them and move forward with their relationship.
@antwowfisher
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