Ron Burgundy is not the only TV anchor to fall victim to a teleprompter gag.

A Today show presenter was snared in an embarrassing prank on live TV when Karl Stefanovic tampered with her autocue script moments before it went to air.

Nine sports reporter Roz Kelly was left red faced after the Anchorman-style gaffe in a report on football team Chelsea's victory in the Europa Cup.

Noting that the tournament was played in Amsterdam, Kelly went on to read out, "How good are the cookies there?"

The joke appeared to dawn on the reporter the instant the words left her mouth.

"See I read everything on the autocue, it's like Anchorman," Kelly said amid raucous laughter on the set.

"As it was coming out of my mouth I knew exactly what had happened."

A Today show source confirmed the line was added by Stefanovic just before it went to air.

"You didn't check your scripts did you," Today host Lisa Wilkinson asked as Stefanovic buckled over in laughter, hiding his face behind a newspaper.

The prank was prompted by Kelly mispronouncing Kyle Baldock’s name as "Kyle Baldcock" in an earlier segment.

Kelly vowed to retaliate saying while Stefanovic had won the battle, "the war has just begun".