Glenn Murray is Brighton's top scorer this season with 22 goals
Brighton were named champions of League One after their hard-fought victory at struggling Walsall.
Inigo Calderon, who scored in the win over Dagenham and Redbridge that sealed promotion on Tuesday, headed the visitors in front.
Andy Butler nodded in an equaliser, but the Seagulls' top-scorer Glenn Murray glanced in a header for 2-1.
The Saddlers' Emmanuel Ledesma saw red for fouling Adam El-Abd before Elliott Bennett lashed home from 30 yards.
Brighton, who are unbeaten at home so far this season, will return to the Championship after a five-year absence.
They do so on the back of a 12-game unbeaten run that stretches back until the end of February.
In stark contrast, Walsall remain in 20th position, level on points with Bristol Rovers in 21st and a point and a game ahead of Notts County in 22nd.
The final whistle was greeted with a pitch invasion by the travelling Brighton supporters.
Brighton manager Gus Poyet told BBC Sussex:
"It's unbelievable to be top and know that no one can go above us, we were the best team in this league by far.
"Elliot Bennett has the best shot and best delivery in the club and I'm so pleased for him today.
"It is a team effort and we told the players not to try and be a hero on your own, and today is about forgetting all worries and just celebrating."
Walsall 29 Walker Booked 04 McDonald (Lancashire - 68' ) 14 Taundry 28 Williams 32 Butler 08 Richards (Ledesma - 60' Dismissed ) 18 Gray 23 Gbarssin Booked 26 Laird 27 Cook (Byfield - 72' ) 10 Macken Substitutes 21 Bevan 02 Westlake 05 Lancashire 30 Ledesma 09 Byfield 11 Nicholls 19 Grigg Brighton & Hove Albion 16 Ankergren 04 Elphick 06 El-Abd 14 Calderon 22 Painter 07 Bennett (Navarro - 90' ) 10 Sparrow (Noone - 63' ) 18 Dicker 26 Bridcutt 09 Barnes (Wood - 76' ) 17 Murray Substitutes 01 Brezovan 37 Dunk 08 Navarro 25 Kishishev 31 Noone 21 Sandaza 39 Wood