Yes, it's an advert for a bra. Sorry, a miracle bra. It also appears on the OK! magazine website - which also happens to be owned by Richard Desmond - so no doubt they have paid handsomely for the coverage.
The article, which begins with the curious question:
Cleavage like crepe paper?
even includes a link to the manufacturer's website.
This is the third time in recent months that an advert has been listed in the Express' news section. Surely the Advertising Standards Authority should be slapping Desmond's knuckles for this, as they did over the printed ads-as-editorial.