Clearly making the most of the heat, the 39-year-old snapped a selfie for her fans, along with the caption: "Hot town, Summer in the city…"
In the photo, Lucy could be seen modelling a plunging floral blouse, designed with ruched sleeves in a glamorous shade of red.
Shielding her eyes from the sun, she added a straw cap to her head and perched some shades on her nose.
Lit up by the golden light, Lucy's skin glimmered with a golden tan, the product of weeks spent enjoying the British sunshine.
In the comments below the snap, her 125,000 followers piled the compliments high, praising Lucy's sense of style and natural beauty.
One said: "Looking absolutely gorgeous."
A second joked: "I don't see how you could get hot as you always appear so COOL."
While a third chimed: "Looking very Chic Lucy."
The Good Morning Britain star took advantage of the soaring temperatures earlier in the week and took a journey down a London waterway on a barge.
Decked out with a captain's hat on her head, the brunette bombshell looked right at home as she steered the canal boat in the right direction.
Lucy, along with her pals, enjoyed a picnic spread of crispy bread, pasta salad, boiled eggs and ham as they cruised the shallow waters.
In her caption, she plugged the summery activity, saying: "Sailing into this weeks heatwave via London's waterways."
As witty as ever, her fellow ITV star Eamonn Holmes got on board with the theme and commented "Ahoy there" below the snap.