Major League Soccer (MLS) has seen some of the world's most talented footballers grace its stage over the years. The introduction of the Designated Player Rule in 2007 ensured an influx of some of the biggest stars in the game.This has led to an improved standard of play as well as bolstering the league's global profile over the years. From exciting goals to unforgettable moments, the MLS has produced some of the most memorable moments in football history.In this article, we take a look at the 10 biggest stars (in no particular order) to ever play in the MLS:#1 David BeckhamPortland Timbers v Los Angeles GalaxyDavid Beckham joined LA Galaxy from Real Madrid in 2007 and immediately became the face of the MLS. The former Manchester United star brought global attention to the league and played a key role in raising its profile around the world.Beckham's impact on the league was immense and he is widely credited with helping to popularize the sport in the United States.Joe Pompliano@JoePomplianoDavid Beckham shocked the world when he left Real Madrid in 2007 to sign with the LA Galaxy of MLS.He was just 31 years old and accepted a 70% pay cut.But his contract included two unique clauses that eventually helped him earn more than $500 million.Here's the story 8110412003David Beckham shocked the world when he left Real Madrid in 2007 to sign with the LA Galaxy of MLS.He was just 31 years old and accepted a 70% pay cut.But his contract included two unique clauses that eventually helped him earn more than $500 million.Here's the story 👇 https://t.co/4iXmaWXjLsBeckham made 98 appearances for LA Galaxy in the MLS, scoring 18 goals and providing 32 appearances.#2 Thierry HenryChicago Fire v New York Red BullsHenry joined the New York Red Bulls from Barcelona in 2010 and immediately made an impact in the league. He was a prolific scorer and his presence helped raise the standard of play.The Frenchman's incredible skill and goal-scoring ability made him a fan-favorite and one of the most recognizable faces in the MLS.#3 Zlatan IbrahimovicChicago Fire v Los Angeles GalaxyZlatan Ibrahimovic joined LA Galaxy from Manchester United in 2018 and marked his debut with a brace in the inaugural derby against Los Angeles FC.The Swede was a dominant force on the pitch and his goals helped the Galaxy reach the playoffs in 2019. His personality and impressive goalscoring record made him one of the biggest stars in the MLS.With 53 goals in 58 games, Ibrahimovic stands out as the most prolific striker to ever play in the league.#4 KakaMLS All-Stars Training SessionKaka joined Orlando City SC from Real Madrid in 2014. Known for his incredible skills, vision, and passing ability, he was a key figure in Orlando's attack.The Brazilian was also a fan-favorite and a vital player for Orlando City until his retirement in 2017. The 2007 Balon d'Or winner had a total compensation package worth $7.2 million with the team which made him the highest paid player in the league then.#5 Frank LampardNew York City vs Colorado RapidsFrank Lampard finally joined New York City FC in 2015 after a loan spell at Manchester City. The Legendary Chelsea midfielder quickly established himself as one of the most important players in the league.Known for his incredible work rate, vision, and goalscoring ability, the Englishman was a key figure in his two seasons at New York City FC, scoring 15 goals in 29 MLS games.BBC Sport@BBCSportFrank Lampard is set to join Manchester City on a short-term loan from New York City FC bbc.in/1pMQF8o http://t.co/C5SwllAzOO5221559Frank Lampard is set to join Manchester City on a short-term loan from New York City FC bbc.in/1pMQF8o http://t.co/C5SwllAzOO#6 Wayne RooneyDC United v Toronto FC - First RoundWayne Rooney joined D.C. United in 2018 after a spell at Everton. The highlight of his time in USA came against Orlando City when he made a last-ditch tackle to stop a counter-attack and immediately assisted a goal, securing his team a 3-2 win in the last minute.In his time with DC United, Rooney scored 23 times in 48 MLS games.#7 Didier DrogbaMontreal Impact v Toronto FC - Eastern Conference Finals - Leg 2Didier Drogba joined Montreal Impact in 2015 after his second stint with Chelsea. The Ivorian scored 21 goals in 33 appearances in the league and was a crucial player for the team during his time at the club.Didier Drogba@didierdrogba🏾 I appreciate @MLS twitter.com/MLS/status/137…Major League Soccer@MLSOne of the greats. Happy birthday, @didierdrogba! 121853One of the greats. Happy birthday, @didierdrogba! 🎊 https://t.co/qNloceB2KE🙏🏾 I appreciate @MLS twitter.com/MLS/status/137…#8 Andrea PirloNew York City FC v Chicago FireAndrea Pirlo joined New York City FC in 2015 as a free agent after leaving Juventus. He played three seasons in America, making a total of 60 MLS games, scoring once and picking up nine assists.#9 David VillaCommissioner Don Garber Announces 2016 MLS MVP AwardDavid Villa joined New York City FC in 2014 after his one-season stint with Atletico Madrid. The former Barcelona striker scored 80 goals and set up another 21 in just 126 appearances in the league.The Spaniard helped New York City reach the playoffs in each of his four seasons with the club and was named the league's Most Valuable Player in 2016.B/R Football@brfootballBREAKING: David Villa named 2016 #MLSMVP430212BREAKING: David Villa named 2016 #MLSMVP https://t.co/c4Anxr6wFg#10 Robbie KeaneNew York Red Bulls v Los Angeles GalaxyRobbie Keane joined the LA Galaxy in 2011 and was an integral part of their success over the next five seasons. The former Tottenham Hotspur and Liverpool striker scored 104 goals and recorded 41 assists in 165 appearances for the club — with nine goals coming in 21 playoff matches.The Irishman is a three-time MLS Cup Champion and was named the MLS MVP for the 2013/14 season.