The reality TV star, 24, took to Twitter and Instagram late on Friday night (26 September) to post the adorable snap of the two-month-old bundle of cuteness.
Alongside the cosy picture, yummy mummy Billie wrote: "Mummy's beautiful little angel."
Billie can be seen planting a tender kiss on the cheek of her sleeping babe - awwwww, bless!
Fans were quick to respond with one saying: "Nelly is so cute!! Like her mummy! Xxx."
One also commented that Nelly "really looks like Sam" and, we have to say, we thought the same!
Billie and fiancé Greg Shepherd welcomed Nelly in July after documenting her pregnancy on ITV reality show, The Only Way Is Essex.
Proud auntie Sam is so smitten with her niece, that she is even thinking of having her own babies soon.
She recently said: "I don't want to leave it too late, maybe 30... because you want to get your figure back."
The 23-year-old then went on to say she'd love to have at least "three or four children", whereas boyfriend Joey admitted he is not so sure he's ready to be a dad.
The star claimed he's "only 24" and "too young" for parenthood.
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See the other celebrity couples who have welcomed babies in 2014:
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