Later Sarah messaged her closest friends she was "buzzing" about getting married."Sarah is absolutely thrilled. She didn't see it coming at all. When he went down on one knee it came as a huge surprise," a source said.
"Their relationship has gone from strength to strength since they moved in together. They are inseparable. Tom has shelled out on a big sparkler to let everyone know she's now taken," the source added. They began dating three years ago after Sarah split from journalist Joe Mott.
However, the spokesman said no wedding date had been set.