Offering a power to weight ration of 120bhp per tonne, the Brabus has a top speed of 122mph and is available in both roadster and roadster coupe versions.
Jeremy Simpson, head of smart in the UK and Ireland, said: 'These two roadsters come with an excellent lineage and have been developed from the V6 Brabus prototype.
'They offer exceptionally good value for money and we expect to see even more showroom activity as the weather improves and motorists' thoughts turn to open-top driving.'
Prices for the roadster Brabus and coupe Brabus are £16,695 on-the-road (OTR) £16,995 OTR respectively.
Both versions have 17-inch alloy wheels, twin sports exhaust, front spoiler and side skirts.
Inside the Brabus has leather trim dash, Brabus instrument graphics, leather/aluminium gearknob, aluminium handbrake handle, aluminium pedals and Brabus floor mats.