Ant & Dec have been appearing on television together since 1989 when they both acted in teen soap Byker Grove.
Turning to Donnelly, he said: "As for you, I've missed you".
He told the audience: "I've missed you all".
He then said: "Thank you for that lovely welcome".
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Sir Keir said: It seems inevitable to me that the government will have to apply for an extension of Article 50. But Mrs May will be keenly aware that whatever move she makes will alienate factions within her own party.
Earlier this month, it was revealed that Lisa, who also works on Strictly Come Dancing, has landing a job on a new TV dating show and this time, she'll be playing a primary role in front of the screen. I'm thrilled, I'm over the moon. "Shall we crack on before I cry?"
Ant is back for Britain's Got Talent 2019 and so are judges Simon Cowell, David Walliams, Alesha Dixon and Amanda Holden. "I mean even though Dec was brilliant, it still wasn't the same", the music mogul said.
"It would be like me not being with David". So on behalf of all of us, welcome back, we're family.
This was the first time Ant and Dec had been reunited on TV following Ant's battle with drink and drug addictions. "The boys are back in town!"
Ant, 43, was involved in a three-car collision in south-west London on 18 March a year ago. He later checked into rehab for prescription drug and drink problems. Get Me Out Of Here! - with Holly Willoughby taking his place.
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Ant has not been in work since being banned from driving for 20 months and fined £86,000, due to his involvement in a auto crash in March 2018 after drinking alcohol and driving.
MARCH 31: Dec hosts first episode of Saturday Night Takeaway without his best pal Ant.
It's the first time the Geordie pair have been seen working together since the last Britain's Got Talent auditions, after which Ant McPartlin did not feature on the rest of the show due to his charge for drink-driving.
One person took to Twitter to say, "Nice to have you back Ant. Dec is great and all that but we all know you're the amusing one".
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US President Trump touts North Korea developments as 'historic result' | #AsiaNewsNetwork
The Beyond Parallel report identified the Sino-ri Missile Operating Base, which has never been declared by Kim Jong Un's regime. Last Wednesday during a meeting in Washington with U.S. ambassadors and charge d'affaires, U.S.
DECEMBER 9: Football manager Harry Redknapp is crowned King Of The Jungle.