Sienna Blake (also Bradley) is a fictional character from the British Channel 4 soap opera Hollyoaks, played by Anna Passey.

The character has had a daughter, Nico (Persephone Swales-Dawson), with Dodger, and twins Sebastian and Sophie with Warren Fox (Jamie Lomas), an affair with Darren Osborne (Ashley Taylor Dawson), a marriage with Ben Bradley (Ben Richards), an affair with Trevor Royle (Greg Wood) who was later killed by Nico, a relationship with her half-sister Liberty Savage's (Jessamy Stoddart) former boyfriend Brody Hudson (Adam Woodward), and been diagnosed with cervical cancer while pregnant.

A troubled girl with serious insecurities, Sienna conceals her cold, cynical and manipulative behaviour beneath a charming, warm exterior.

[5] When she joined the show, Passey was disclosed the background of Sienna's character by the producers, "I knew all about her upbringing and the problems she'd had with her family.

"[6] On 20 May 2014, it was announced that actress Persephone Swales-Dawson would play Nico Blake, who is revealed to be Sienna's long lost daughter.

A spokesperson told Digital Spy today: "Sienna and Dodger were estranged as children and each did not discover they had a twin until adulthood.

In an interview with Danny Mac, conducted at the Inside Soap Awards 2014, Daniel Kilkelly noted how some fans loved the twist with Dodger being Nico's father, whereas others hated it.

[15] On 28 December 2018 it was announced that Sienna will be sexually harassed by a newcomer Laurie Shelby (Kyle Pryor), when he holds onto her waist for an uncomfortable amount of time.

On-screen, the character meets with a woman who he sexually assaulted and has paid to sign a non-disclosure agreement, ensuring that the truth is not revealed.

[17] Sienna was raised by her controlling and physically abusive father Patrick Blake (Jeremy Sheffield), after her mentally unstable mother Anna Blake (Saskia Wickham) left with twin brother Mark, known as Dodger Savage (Danny Mac) after trying to kill Sienna and Dodger in a murder/suicide attempt.

Sienna became pregnant at this time, not knowing that her brief encounter with the teenage boy was in fact her estranged twin brother Dodger, and was locked in a basement whilst she had the baby.

Sienna secures a job at the local pub and befriends Darren (Ashley Taylor Dawson) and Nancy Osborne (Jessica Fox).

Problems in the Osborne household arise from Esther Bloom (Jazmine Franks) and Tom Cunningham (Ellis Hollins) who still support Nancy.

Gangster Fraser Black (Jesse Birdsall) sways a corrupt judge to let Sienna walk free.

She and Will later told Theresa McQueen (Jorgie Porter) to kill Dodger, since they knew that she murdered Calvin Valentine (Ricky Whittle) five years ago, but she refuses.

With Will in a coma, and later killed by Gloved Hand Killer, Dodger leaves the village forever and Sienna admitted to a mental illness facility.

She starts to suspect that Ben is being unfaithful following his visits with a mystery woman named Carly (Sophie Wise).

Subsequently, Nico murders Trevor on his wedding day to Grace Black (Tamara Wall); fearing that Sienna would run away with him.

Warren murders Bart McQueen (Jonny Clarke) after suspecting him to be involved in his sister Katy's (Hannah Tointon) death.

Warren later begins an affair with Grace after revealing that he has put plans in place to take the twins away from Sienna as soon as they are born.

She meets up with Ben in the Hutch but his son Josh Bradley (Rupert Hill) shows up instead and confronts Sienna for ruining his father's life.

Sienna berates Brody over cheating on Liberty, unaware of the recent revelation of his sexual abuse from Buster Smith (Nathan Sussex).

Sally is furious and is about to take action but Imran Maalik (Ijaz Rana) tells her that the lesson was enjoyable so she relents and decides to give Sienna a chance.

While teaching a class, Sienna wrongly accuses autistic teenager Brooke Hathaway (Talia Grant) of stealing a model heart and shouts at her before grabbing her by the arm causing her to have a meltdown.

When Sienna notices that Laurie switched the books with The Thaming of The Shrew she has a meltdown which is witnessed by Sally who warns her that she could lose her job.

However, Sinead is arrested for giving the police the wrong information about the night Laurie raped her and he is allowed return to work.

Sienna meets Sid Sumner (Billy Price) who killed his father in self-defence due to his actions as a far-right extremist.

[21] The nomination made the viewer-voted shortlist,[22] although she lost out to Lucy Fallon, who portrays Bethany Platt in Coronation Street.

She noted that a backstory consisting of a woman beating father, unhinged mother and long-lost brother left her normality doomed.

A startled Passey told an Inside Soap reporter that Sienna gained sympathy following revelations about her long-lost daughter.