The 52-year-old rock star has reunited with his brother Noel for the long-awaited Oasis reunion tour, and Liam has been a "total professional" in his approach to the shows.
"Liam arrives 45 minutes before he goes on stage and leaves immediately afterwards," a source told The Sun newspaper's Bizarre column.
"At Cardiff he had a car driven into the stadium to take him back to his hotel immediately. Liam is being a total professional and is laser-focused on giving Oasis fans the best show he can."
Liam is well-known for his outspoken personality, but the insider suggested he's matured since Oasis split back in 2009.
"It's incredible to see how well behaved he is being. It's like he's properly grown up now," the source said.
Noel and Liam's mother Peggy recently revealed she was the "instigator" of their reconciliation.
Peggy urged her sons to put their differences aside - but she could not have made them do anything they did not want to.
Speaking to Ireland's Mail on Sunday newspaper, she explained: "I was the instigator, yes. But sure, wasn't it always going to happen at some time or other?"
"It was their choice, of course.
"Look you can't force them to do things they don't want to do.Â
"You just have to say, 'Get on with it' and I said that."
Peggy is thrilled that her warring sons have finally made up.
She said: "It's great, because nobody wants their kids falling out, do they?"
Peggy also revealed that she was looking forward to watching her sons in action in Dublin.
Peggy actually intends to reunite with some other members of her family, including her sister, at the Dublin show.
She shared: "I'm hoping to get to the Oasis concert in Dublin in August if I can hobble around. That's my plan anyway ... it will be great.
"I know the Irish fans are thrilled about it. There's great excitement in Ireland about the reunion tour and it will be lovely to see family there, also my sister Kathleen. I am really looking forward to the Dublin one."
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