A representative for the couple told the Daily Mail that Jenson and Jessica were "delighted" to confirm that they are set to tie the knot after she was seen sporting a large diamond engagement ring during a trip to Bahrain.
Jessica, 29, who has been dating 34-year-old Jenson for five years, was seen wearing the sparkler as she enjoyed a walk in the Arabian country.
Japanese model Jessica showed off the teardrop shaped diamond, which is set in a diamond-encrusted silver band, as she sat in the paddock during day three of Formula One Winter Testing.
Jessica and Jenson first met in 2008 in a hotel bar in Tokyo and began dating eight months later.
The couple have maintained a low profile although Jessica is regularly seen supporting F1 star Jenson at his races.
In 2-11 the sporty duo were seen snuggling up to each other after taking part in the Blenheim Triathlon.
Wearing their medals after the event, which involved a 750m swim, 20km bike ride and 5km run, the pair looked very much in love.