Inside Millie Bobby Brown and David Harbour’s alleged fallout behind 'Stranger Things 5’

Millie Bobby Brown and David Harbour put on a united front at the Stranger Things season five world premiere on Thursday, November 6.

However, according to RadarOnline, the 21-year-old actress and the 50-year-old actor "pretended" to be close during interviews and press appearances while reports suggested underlying tension off-screen.

PR expert Alexandria Hurley told the publication, "Promotional appearances and public dynamics are often not reflective of private working relationships — especially on high-stakes sets"

She added, "Cast members are contractually obligated to participate in press, joint interviews, and branding moments that reinforce the on-screen bond.”

For those unversed, Millie reportedly accused David, who plays her adoptive dad in Stranger Things, of “bullying and harassment” during the filming of the hit Netflix series.

The Enola Holmes actress even filed "pages and pages" of formal complaints before the series wrapped filming its fifth and final season.

Despite ongoing speculation about Millie Bobby Brown and David Harbour’s allegedly strained relationship, the pair were seen hugging and smiling at the Stranger Things final season premiere in Los Angeles, putting the rumours of a rift to rest for now.