Heidi Costello (also Blissett) is a fictional character from the British Channel 4 soap opera Hollyoaks, played by Kim Tiddy.

On 12 April 2010, media entertainment website Digital Spy reported that a new family, the Costellos, would be introduced to Hollyoaks as part of the soap's ongoing rejuvenation.

[3] Of the castings, Hollyoaks series producer Paul Marquess stated: "We can't wait for this huge new boost of energy exploding on screen.

Heidi visits Cindy Cunningham's (Stephanie Waring) boutique Cincerity and asks her to showcase her clothes at the fashion show for a challenge.

When Mitzeee speaks to Theresa McQueen (Jorgie Porter) through her microphone, Heidi hears that she had sex with Carl.

Heidi purchases Cincerity with Gabby Sharpe (Phina Oruche) acting as a silent partner.

Whilst Heidi is preparing a family meal, she burns herself with boiling water and goes to Dee Valley Hospital.

Gaz Bennett (Joel Goonan) finds employment at The Dog in the Pond and becomes attracted to Heidi.

Doug Carter (PJ Brennan) asks Heidi for help organising a stag weekend and Gaz tells Carl.

Rae Wilson (Alice Barlow) finds the photo on Gaz's phone and sends it to Heidi.

Heidi is unaware that after the wedding, Silas kidnapped Mercedes and is currently holding her hostage in the basement under the Dog in the Pond.

Later on, Heidi goes to the party dressed as 'Catwoman', unaware that Lynsey Nolan (Karen Hassan) and Texas are wearing the same costume.

As he throws her body to the ground, Silas sees blonde hair under the wig and is visibly distressed when he realises he has murdered his daughter.

[7] Holy Soap describe Heidi's most memorable moment as "beating manipulative Cindy a fashion challenge.

"[6] In July 2010, Heidi came fourth in a poll run by the official Hollyoaks website to find viewers favourite member of the Costello family.

[8] Heidi's death was voted the biggest OMG moment of the year for a special "Hollyoaks: Best Bits of 2011".