Not being able to resist capturing a selfie of the tender moment, the snap sees Millie pout up a storm as she leans her wet head against her adorable pup, prompting him to softly lick her cheek.
'Puppy love,' the former Made in Chelsea star captioned the sweet shot.
The image was a lot less racy than that Millie's rapper husband shared in September, which showed him resting his feet against her bare breasts as they bathed together.
Ironically, Pro instead chose to draw attention to the fact that his gorgeous, and seemingly coy, wife was far more tanned than him, which he makes light of in the caption.
He wrote beside the snap: '#bathfortwo #merelysavinghermodesty #couldibeanypaler' [sic].
The reality star's intimate bath snap comes just a short while after she spent the weekend at the Melbourne Cup in Australia.
Reiterating her style credentials, the pretty blonde slipped herself into a periwinkle blue midi gown by designer By Johnny, highlighting her svelte silhouette.
The star accessorised her glamorous look with a silver clutch bag and a set of jewel rings.
Her headpiece was created by celebrity milliner Viktoria and featured an intricate pattern of encrusted leafy embellishments.
The British beauty completed her look with a soft sweeping of blush, some flirty faux lashes and a light pink slick of lip-gloss.
The English reality star spent her day at the races rubbing shoulders with celebrities in the Emirates Marquee.
Millie is a track-side regular at England's most prestigious racing carnivals, and brought her international racing experience to the fore at Melbourne's Flemington Racecourse as she attended Derby Day on Saturday.
She jetted Down Under this week after putting her best fashion foot forward at Elle MacPherson's Super Elixir One-Year Anniversary event in London.
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Source: http://www.dailymail.co.uk/tvshowbiz/article-3303849/Millie-Mackintosh-trades-husband-Professor-Green-pet-dog-follows-Instagram-snap-sweet-image-bathing-pooch.html