Heidi Montag has had a breast reduction.

The former 'The Hills' star, who shocked her fans after she underwent 10 plastic surgery procedures in one day in 2010, has gone under the knife again to have her implants reduced, taking her from a size F to a size D.

The 27-year-old blonde beauty told 'Entertainment Tonight' host Brooke Anderson that she had her breasts downsized for ''health reasons.''

Heidi - who married her reality TV co-star Spencer Pratt in 2008 - previously hit back at reports suggesting she regretted her cosmetic surgeries but admitted she wouldn't recommend it.

She said: ''It could have been really disastrous. I lived and I learned, and I wouldn't really recommend it for other people.

''It was a lot harder than I thought it would be going through it - physically, mentally, emotionally and the recovery. I'm just glad it's done and that everything healed so well.''

However she also blamed her plastic surgeon, Dr. Frank Ryan, who died in a tragic car accident on the Pacific Coast Highway in 2010, for her excessive procedures.