*It’s official – Beyonce’s fourth solo studio album, “4,” enters the Billboard 200 albums chart at No. 1, selling 310,000 copies according to Nielsen SoundScan.

The album is her fourth solo No. 1, and fourth studio set to top the list. She’s only the third act — and second woman — to see their first four studio albums debut atop the Billboard 200. Britney Spears did it with her first four between 1999 and 2003 while DMX’s first five all started at No. 1 between 1998 and 2003

“4’s” sales launch is lowest of her four releases: 2008’s “I Am … Sasha Fierce” entered with 482,000; 2006’s “B’Day” bowed with 541,000 and 2003’s “Dangerously In Love” started with 317,000.

According to Billboard, the lack of a smash hit single on”4″ thus far could help explain the album’s softer entry. Its lead track, “Run the World (Girls),” peaked at No. 29 on the Billboard Hot 100 — the first time the first single from a Beyonce studio set has missed the top 10.

Still, “4’s” bow is pretty big for 2011. It marks the third-largest sales week of the year, after the No. 1 bows of Lady Gaga’s “Born This Way” (1.1 million) and Adele’s “21” (351,000).

Also arriving in the top 10 this week is rapper Big Sean’s debut album “Finally Famous” (No. 3 with 87,000. Last week’s No. 1 album, Jill Scott’s “The Light of the Sun,” drops to No. 5 with 55,000 (down 60%) while Adele’s “21” moves 3-2 with 92,000 (down 10%).

Over on the Digital Songs chart, LMFAO’s “Party Rock Anthem” (featuring Lauren Bennett & GoonRock) ascends to No. 1 for the first time (rising two spots with 258,000; up 22%), bumping Katy Perry’s “Last Friday Night (T.G.I.F.)” down to No. 2 (206,000; down 9%).

Javier Colon, winner of NBC's "The Voice"

The top debuts on Digital Songs this week belong to “The Voice” winner and runner-up Javier Colon and Dia Frampton, respectively, whose singles “Stitch by Stitch” and “Inventing Shadows” arrive at Nos. 6 and 7 (145,000 and 137,000).

Colon also debuts at No. 24 with his “Man in the Mirror” duet with his “Voice” coach Adam Levine (75,000). Frampton concurrently makes her mark with a second debut, at No. 33: her “I Won’t Back Down” collaboration with her coach, Blake Shelton (62,000). Frampton also falls 61-67 with “Heartless” (32,000; up less than 1%), and “Losing My Religion” (28-69 with just under 32,000; down 52%).

Fourth place contestant Beverly McClellan’s duet with her coach Christina Aguilera on the latter’s own hit “Beautiful” debuts at No. 52 (42,000). One rung lower, third place finisher Vicci Martinez’s “Afraid to Sleep” arrives (39,000). Her duet with coach Cee Lo Green on “Love is a Battlefield” misses the 75-position chart, but sold 25,000 downloads.

Pitbull’s “Give Me Everything” (featuring Ne-Yo, Afrojack & Nayer), rises 4-3 (192,000; up 2%), Nicki Minaj’s “Super Bass” rises 6-4 (169,000; up less than 1%), Adele’s “Rolling in the Deep” is steady at No. 5 (152,000; down 11%) and Lil Wayne’s “How to Love” climbs 10-8 (128,000; down 1%).