“Big Mo! Not the little one!” EastEnders icon Laila Morse, best known for playing the unforgettable Big Mo Harris, has gone viral after starring in an unexpected collaboration with sportswear giant Reebok. The short clip, which has been widely shared across social media, sees Morse casually crossing a road before a van suddenly pulls up beside her. Rapper K-Trap then emerges and hands the soap legend a bright red Reebok shoebox.

After thanking him, the video cuts to Big Mo confidently showing off a fresh pair of white Reebok trainers, instantly winning over fans online.

The unlikely collaboration has sparked a wave of praise, with many viewers celebrating the decision to feature one of Britain's most recognisable soap characters rather than a typical celebrity influencer.

One social media user wrote: “Whoever is on the Reebok PR and marketing team is a genius.”

Another commented: “If you grew up on an estate, you've definitely come across a Big Mo.”

Others couldn't resist referencing one of the character's most memorable catchphrases, writing: “Big Mo, not the little one.”

A further fan added: “Eastside finest. E20 stand up.”

The campaign has resonated with audiences thanks to Big Mo's status as a beloved British television character. Known for her sharp wit, larger-than-life personality and no-nonsense attitude, Big Mo has been a fixture of Albert Square for more than two decades.

Laila Morse, now 80, first joined EastEnders in 2000 and quickly became one of the soap's most popular characters. Over the years, Big Mo has delivered countless memorable moments, cementing her place as one of Walford's most iconic residents.

Away from the Square, Morse also has a famous family connection. She is the older sister of Oscar-winning Hollywood actor Gary Oldman, known for roles in films including Darkest Hour, Tinker Tailor Soldier Spy and the Harry Potter franchise.

While Reebok has worked with athletes, musicians and influencers over the years, few collaborations have generated the same level of nostalgic affection as its latest campaign featuring Big Mo. For many viewers, the advert perfectly captured a familiar British character that generations have grown up watching.

And judging by the reaction online, Big Mo's unexpected turn as a Reebok ambassador has proven one thing: she's still one of the nation's most-loved TV legends.