Nicole Sherzinger and her boyfriend may or may not be engaged.

According to some reports, Nicole Scherzinger and Lewis Hamilton are engaged. According to others, the former Pussycat Doll jetted back to Heathrow Airport without an engagement ring.

But the big news circulating is that Nicole Scherzinger finally agreed to marry her British racing driver boyfriend, Lewis Hamilton after reportedly saying no three times.

According to reports, world champion Formula 1 driver Lewis Hamilton finally wore down Nicole Scherzinger.

Hamilton proposed to former "X Factor" judge Scherzinger at his Swiss mansion.

Last week Hamilton hinted at his proposal plans when he described Scherzinger as his "wifey" on Instagram along with a picture of himself with Nicole at the Sistine Chapel in the Vatican City.

He wrote "This was a great day.... Truly humbled by the Sistine Chapel plus there with my wifey."

A source told the Star Hamilton popped the question this weekend. Scherzinger will reportedly move into his Swiss mansion. The source said "Lewis will be the main breadwinner when Nicole is not working and she will always have access to his private jet if she needs to travel. It is the ideal plan for both of them and will hopefully lead to a big summer wedding in August when Lewis has a three-week break from his F1 schedule."

As the headlines blared, Nicole Scherzinger landed at London's Heathrow Airport yesterday wearing a baseball cap, designer sunglasses, a zipped-down jacket and black leggings, but no engagement ring.

Nicole Scherzinger recently took to Twitter to congratulate her boyfriend when he finished in pole position in a qualifying race ahead of the Australian Grand Prix.

Nicole tweeted: "Congratulations @LewisHamilton So proud of u 4 taking pole position! First race of the season! @f1 #AustralianGP Race ur heart out babe! xo"

According to reports, the former Pussycat Doll and the British F1 racing champion broke up but got back together late last year. Sources say Scherzinger and Lewis are planning the wedding for August.