Gwen Stefani's 'Hella Good' gift to beau Blake Shelton on his 40th b'day

Seems like Blake Shelton's 40th birthday with girlfriend Gwen Stefani was a 'Hella Good' one.

The 46-year-old pop and ska singer shared the stage with her beau as a surprise guest to sing the duet 'Go Ahead and Break My Heart' at Country Jam 2016, reports E!Online.

Later, Stefani returned to the stage and performed her band's 2001 song 'Hella Good' after which the couple sealed their love with a kiss.

In the videos and photos posted on Snapchat by the 'Hollaback Girl' hit-maker, the pair can be clearly seen enjoying the day.

Shelton was presented with the ultimate gag gift, a pair of wine glasses bearing caricatures of him and Stefani, along with two cakes - one shaped rectangular and decorated with colorful sprinkles and balloons, and another carved like a black acoustic guitar.

Earlier in the day, Stefani wished Shelton a happy birthday on social media in the cutest way, dubbing him to be her "favorite person."

The duo started dating last October on the sets of the 'The Voice'.