The England international admitted to being nervous before pulling on the famous jersey for the first time as he made his debut for the Reds after his move from Southampton
The 32-year-old striker follows in the footsteps of the likes of Robbie Fowler, Fernando Torres and Ian Rush in wearing the iconic shirt and, as a boyhood fans, says he would have been happy with any number after joining the club from Southampton.
"I've always seen myself as a No.9 as it's the type of player I am, and to get it at Liverpool is unbelievable," the close-season signing told Liverpool's official website.
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"I would have been happy with any number because as long as that badge is on the front I would have been happy with any shirt, but to get No.9 is special for me."
Goals from Suso and Kristoffer Peterson in the space of three second-half minutes changed for the game for Liverpool at Deepdale following Josh Brownhill's opener.
Lambert played the first half in his first game since representing England at the World Cup and admitted it was an emotional experience.
"It was special," he added. "I had to get a few moments in check at the beginning, but it was special.
"Obviously I'm professional, I'm 32 now and I'm able to get my emotions in check, and now it's all about my fitness.
"That's all I was concentrating on, trying my best and trying to get a goal. I was a little bit disappointed not to get a goal but I thoroughly enjoyed it.
"I was nervous before kick-off and I probably haven't been that nervous for a while.
"I've played in a lot of big games in my career and that's the most nervous I've been before a game for a while, but it was a special moment for me and one I'll remember."